1 cm³ = 10⁻⁶ m³ Applications engineer, data analyst, accelerator operator and aeronautical engineering are some of the prominent employment areas after completing graduation with physics as a major. 14. Answer: (a) 1 (b) 3 (c) 4 (d) 4 (e) 4 (f) 4. Question 15. (d) the air inside this room contains a large number of molecules Question 2. -2 a-2 c = 1 seem to be stationary. =π (0.08)2/π(5 x 10-5)=64 x 10-4/25 x 10-10=2.56 x 106 The set of solutions can be accessed on multiple devices. We have to try to make permutations and combinations of the universal constants and see if there can be any such combination whose dimensions come out to be the dimensions of time. .•. (c) the mass of Jupiter is very large \(\begin{array}{l}{\text { (c) Using the conversion, }} \\ {1 \mathrm{km} / \mathrm{h}=\frac{5}{18} \mathrm{m} / \mathrm{s}} \\ {18 \mathrm{km} \mathrm{h}=18 \times \frac{5}{18}=5 \mathrm{m} / \mathrm{s}}\end{array}\) (a) atoms are very small objects Answer: We known that speed of laser light = c = 3 x 108 m/s. A wire has a mass 0.3 ± 0.003 g, radius 0.5 ± 0.005 mm and length 6 ± 0.06 cm. Explain why? Question 4. If not, guess the correct relation. or D=3 x 1011/9.7 x 10-6 m =30 x 1016/9.7 m l = (1.37 ± 0.01) cm w = (4.11 ± 0.01) cm h = (2.56 ± 0.01) cm Lower limit of the volume of the block is, Obtain the dimensions of relative density. Pages. Number of molecules of air in the class room Long Answer Type Questions A boy recalls the relation almost correctly but forgets where to put the constant c. He writes: They ensure a smooth and easy knowledge of advanced concepts. Do you think this relation can be correct? Study Rankers - Free download of NCERT Solutions for Class 12 Physics Chapter 13 - Nuclei solved by Expert Teachers as per NCERT (CBSE) textbook guidelines. r = 1.2 x 10-15 (23)1/3 m = 1.2 x 2.844 x 10-15 m =3.4128 x 10-15 For a glass prism of refracting angle 60°, the minimum angle of deviation Dm is found to be 36° with a maximum error of 1.05°. .-. (Given: r = r0 A1/3) Mass of nucleus = A (f) This is a correct statement. Question 25. If you have any query regarding NCERT Solutions for Class 11 Physics Chapter 2 Units and Measurements, drop a comment below and we will get back to you at the earliest. Answer: Given angular diameter θ = 35.72= 35.72 x 4.85 x 10-6 rad As we approach the higher class like class 11, students need more help along with the NCERT textbooks. Question 1. Find the power consumed by the lamp. Given that the time period T of oscillation of a gas bubble from an explosion under water depends upon P, d and E where P is the static pressure, d the density of water and E is the total energy of explosion, find dimensionally a relation for T. What do you mean by order of magnitude? These objects (known as quasars) have many puzzling features, which have not yet been satisfactorily explained. St =nV/400 It is the distance of an object that will show a parallax of 1″ (second) of arc from opposite ends of a baseline equal to the distance from the Earth to the Sun. Answer: No. Free PDF download of NCERT Solutions for Class 11 Physics Chapter 3 - Motion in a Straight Line solved by Expert Teachers as per NCERT (CBSE) textbook guidelines. Define parsec. A Vernier Caliper is used to measure the length, width and height of the Mock. Topics and Subtopics in NCERT Solutions for Class 11 Physics Chapter 2 Units and Measurements: NCERT Solutions Class 11 PhysicsPhysics Sample Papers, Question 2. Do mass and weight have the same dimensions? Applying principle of homogeneity of dimensional equation, we find that (d) The air inside this room contains more number of molecules than in one mole of air. (d) The air inside this room contains more number of molecules than in one mole of air. He could not understand pound and how it is converted into rupees. }}\end{array}\), NCERT Solutions for Class 11 Political Science, NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 12 Sociology Chapter 4 The Market as a Social Institution, NCERT Solutions for Class 12 Sociology Chapter 3 Social Institutions: Continuity and Change, NCERT Solutions for Class 12 Sociology Chapter 5 Patterns of Social Inequality and Exclusion, NCERT Solutions for Class 12 Sociology Chapter 6 The Challenges of Cultural Diversity, NCERT Solutions for Class 12 Sociology Chapter 2 The Demographic Structure of the Indian Society, NCERT Solutions for Class 12 English – Kaliedoscope, Vistas, Flamingo, NCERT Solutions for Class 11 Physics Chapter 3 Motion In A Straight Line, Click here to buy NCERT Book for Class 11 Physics. The dimensions of energy per unit volume are the same as those of Question 1. NCERT Solutions for Class 11 Physics Chapter 2 Units and Measurements are part of NCERT Solutions for Class 11 Physics. This is because the interatomic separation in the gas is very large compared to the size of a hydrogen molecule. (e) This is a correct statement. Volume of one mole of hydrogen, VH An experiment measured quantities a, b, c and then x is calculated by using the relation ab2x =ab2/c3. (d) the number of strands of hair on your head Physical quantities are called large or small depending on the unit (standard) of measurement For example, the distance between two cities on earth is measured in kilometres but the distance between stars or intergalactic distances are measured in parsec The later standard parsec is equal to \(3.08 \times 10^{16} \mathrm{m} \text { or } 3.08 \times 10^{12} \) km is certainly larger than metre or kilometre Therefore, the inter-stellar or intergalactic distances are certainly larger than the distances between two cities on earth. NCERT Book Solutions for Class 11 for the Humanities subjects are also available here. Also the magnetic moment has the units Am2 so that its dimensions can be written as [AL2] where A stands for the dimensions of the electric current. and average width of the image of hair as seen by microscope = 3.5 mm Name two pairs of physical quantities whose dimensions are same. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get an upper bound on the quantity): A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under water. = 7.38 x 1010 m Answer:  No. Download Class 11 Physics NCERT Solutions in pdf free. Let d2 be the depth of boat in water when the elephant is moved into the boat. Guess where to put the missing c. Answer: One light year = speed x time = 9.462 x 1015 m. When two physical quantities are multiplied, the significant figures retained in the final result should not be greater than the least number of significant figures in any of the two quantities. Multiple Choice Questions Chapter 1: Units And Measurements; Chapter 2: Motion in a Straight Line; To express these in terms of F, A and V, we must express, M, L and T in terms of these new ‘fundamental’ quantities. One such combination is: QUESTIONS BASED ON SUPPLEMENTARY CONTENTS, Question 1. (c) the wind speed during a storm V ) = (1.37 – 0.01) x (4.11 – 0.01) x (2.56 – 0.01) cm3 = (1.36 x 4.10 x 2.55) cm3 = 14.22 cm3 The earth-moon distance, S = 3.8452 x 108 m .’. (a) 1 (b)2 (c)3 (d)5 = 1.5 x 1011 m. Answer:  We know that speed of laser light, c = 3 x 108m/ s Time of echo, t = 8.2 minutes = 8.2 x 60 seconds From the figure, Study every day: A student should study NCERT text book one hour per day for seven days. Estimate the mass density of sodium nucleus. Average density (D)=Mass/Volume=M/V= 0.005517 x 106 kg  m-3 =55.4 cm2, Question 2. kg m-3. (e) 6.032 N m-2 (f) 0.0006032 m2 ... Notes Of Ch 2 Units And Measurements Class 11th Physics by studyrankers.com. Answer:  No, 1 A = 10-10 m t = 3.0 billion years = 3.0 x 109 years As 1 ly = 9.46 x 1015 m Thickness of hair =3.5 mm/100 = 0.035 mm. (d) Let us assume that the man is not partially bald. }}\end{array}\). Question 3. Hence in terms of new unit , = \(1 \mathrm{kg}=\frac{1}{\mathrm{a}}=\alpha^{-1}\) D=b/20=3 x 1011/2 x 4.85 x 10-6 m Question 2. Answer:  Here l = (25.2 ± 0.1) cm To find the value of ‘g by using a simple pendulum, the following observations were made : Length of thread l = (100 ± 0.1) cm }}\end{array}\) Answer:  As the Reynold’s number NR depends on density p, average speed v and coefficient of viscosity η, then let us say, Question 11. ft is required to find the volume of a rectangular Mock. The principle of ‘parallax’ is used in the determination of distances of very distant stars. This was the actual motivation behind the discovery of radar in World War II. These NCERT Solutions were made by the expert teachers of physics. To get the latest copy of NCERT Solutions for Class 11 Physics Chapter 3 visit Vedantu.com Question 2. Answer: RADAR stands for ‘Radio detection and ranging’. (b) Difference of mass = 2.17 – 2.15 = 0.02 g The SI units of magnetic field is unit of time is ys. Now Vg/VH=22.4 x 10-3/3.1548 x 10-7 =7.1 x 104 Writing down the dimensions of both sides of equation (i), we get, Question 10. Is nuclear mass density dependent on the mass number? Accuracy of 1 part in 1011 to 1012. And selecting the correct study material and study tools will have a huge impact on the student’s result and academic performance. It t be the thickness of oleic acid film formed over water surface then the volume of oleic acid film = St Find the area of the rectangular block. (b) A screw gauge has a pitch of 1.0 mm and 200 divisions on the circular scale. \(\begin{array}{l}{\text { (b) The total surface area of a cylinder of radius } r \text { and height } h \text { is }} \\ {S=2 \pi r(r+h)} \\ {\text { Given that, }} \\ {r=2 \mathrm{cm}=2 \times 1 \mathrm{cm}=2 \times 10 \mathrm{mm}=20 \mathrm{mm}} \\ {h=10 \mathrm{cm}=10 \times 10 \mathrm{mm}=100 \mathrm{mm}} \\ {\therefore S=2 \times 3.14 \times 20 \times(20+100)=15072=1.5 \times 104 \mathrm{mm} 2}\end{array}\) Assuming that T = k Pa db Ec and substituting dimensions of all the quantities involved, we have Volume of water displaced by (boat + elephant), V2 = Ad2 Volume of water displaced by elephant, (a) FPS system Mass of the block (m) = 39.3 g NCERT SOLUTION, CLASS 11, PHYSICS, PHYSICAL, CBSE BOARD . 10. So, the unit of c is ms-2. What does SONAR stand for? The value of l and h are 4.0 cm and 0.065 cm respectively where l is measured by a metre scale and h by the spherometer. Mass of earth = — x 3.142 x (6.37 x 106)3 x 5.517 x 103 kg (d) Relative density of a substance is given by the relation, IV. Ans : Physical quantities are called large or small depending on the unit (standard) of measurement For example, the distance between two cities on earth is measured in kilometres but the distance between stars or intergalactic distances are measured in parsec The later standard parsec is equal to \(3.08 \times 10^{16} \mathrm{m} \text { or } 3.08 \times 10^{12} \) km is certainly larger than metre or kilometre Therefore, the inter-stellar or intergalactic distances are certainly larger than the distances between two cities on earth. Measure the length of this coil, mode by the thread, with a metre scale. 13. Answer: The values of different fundamental constants are given below: The number of hair on the head is clearly the ratio of the area of head to the cross-sectional area of a hair. Given, nR is directly proportional to r. From the table of fundamental constants in this book, try to see if you too can construct this number (or any other interesting number you can think of). Moreover, it would be technically difficult to maintain uniformity of the pitch of the screw throughout its length. The density of a cylindrical rod was measured by using the formula ρ=4m/πD2l Question 7. The number of hair on the human head is of the order of one million. This led him to an interesting observation. What is the linear magnification of the projector-screen arrangement? = 3.09 x 1016 m = 3 x 1016 m. Question 2. A force of (2500 ±5) N is applied over an area of (0.32 ± 0.02) m2. So, the new unit of length is 3 x 108 m. That is, the baseline is about the diameter of the Earth’s orbit =3 x 10 n m. However, even the nearest stars are so distant that with such a long baseline, they show parallel only of the order of 1″ (second) of arc or so. The Sun is a hot plasma (ionized matter) with its inner core at a temperature exceeding 107 K, and its outer surface at a temperature of about 6000 K. At these high temperatures, no substance remains in a solid or liquid phase. The density is accurate only up to three significant figures which is the accuracy of the least accurate factor, namely, the radius of the earth. The SI units of the universal gravitational constant G are 16. (c) CGS system. It will help you stay updated with relevant study material to help you top your class! A book with many printing errors contains four different formulas for the displacement y of a particle undergoing a certain periodic motion: (i) charge on electron (e), (ii) permittivity of free space (ε0), (iii) mass of electron (me), (iv) mass of proton (me) (v) speed of light (c), (vi) universal gravitational constant (G). \(1 \mathrm{g}=\frac{1}{1000} \mathrm{kg}\) [T] = [M L-1 T-2]a [M L-3]b [M L2 T-2]c  Equating powers of M, L and T on both sides, Answer:  As Area = (4.234 x 1.005) x 2 = 8.51034 = 8.5 m2 \(\begin{aligned} \text { Density of lead } &=\text { Relative density of lead } \times \text { Density of water } \\ &=11.3 \times 1=11.3 \mathrm{g} / \mathrm{cm}^{3} \end{aligned}\) Also, wherever you can, give a quantitative idea of the precision needed. If distance of Venus be d, then t = 2d/c What is (a) the total mass of the box (b) the difference in the masses of the pieces to correct significant figures? (a) M°L T2 (Ib) M°L2 T-4 (c) M°L T3 (d) M°L2T3 However, the line of sight of distant and large size objects e.g., hill tops, the Moon, the stars etc., almost remains unchanged (or changes by an extremely small angle). respectively. \(\begin{aligned}(c) G &=6.67 \times 10^{-11} \mathrm{Nm}^{2} \mathrm{kg}^{-2}=6.67 \times 10^{-11} \frac{\mathrm{kg} \mathrm{m}}{\mathrm{s}^{2}} \mathrm{m}^{2} \mathrm{kg}^{-2} \\ &=6.67 \times 10^{-11} \mathrm{kg}^{-1} \mathrm{m}^{3} \mathrm{s}^{-2} \\ &=6.67 \times 10^{-11} \frac{\mathrm{m}^{3}}{\mathrm{kgs}^{2}}=\frac{6.67 \times 10^{-11} \times\left(10^{2}\right)^{3}}{\left(10^{3}\right)^{2}} \\ &=6.67 \times 10^{-8} \mathrm{cm}^{-3} \mathrm{s}^{-2} \mathrm{g}^{-1} \end{aligned}\). Answer: Question 6. 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(c) Speed of vehicle = 18 km/h = 18 x 1000/3600 m/s A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. Further, it was a very large number, its magnitude being close to the present estimate on the age of the universe (-15 billion years). This is equal to the diameter of the thread. Density of water = 1 g/cm³ What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance? Chapter 3 Motion In A Straight Line Download in pdf . (c) The mass of Jupiter is very large compared to that of the earth. Dirac found that from the basic constants of atomic physics (c, e, mass of electron, mass of proton) and the gravitational constant G, he could arrive at a number with the dimension of time. The radius of curvature of a concave mirror, measured by a spherometer is given by R=l2/6h +h/2 i. e., [L1 T-1] = dimensionless, which is incorrect. On solving these equations, we find that 28. (c) newton per ampere per metre (d) all the above Why is this ratio so large? Compare it with the average mass density of a sodium atom obtained in Exercise 2.27. Answer:  In order to find out the accuracy of the given equation we shall compare the dimensions of T and rh ρg/2cos θ. III. =11.3 x 103 kg m-3 [1 kg =103 g,1m=102 cm] Hence more reliable result can be obtained. Find the dimensions of the following quantities Volume of Sun = 4/3πr3 x 3.14 x (7 x 108)3  = 1.437 x 1027 m3 \(\begin{aligned}(b) 3 \mathrm{ms}^{-2} &=\frac{3 \times 10^{-3} \mathrm{km}}{\left(\frac{1}{3600}\right)^{2} \mathrm{h}^{2}}=3 \times 3600 \times 3600 \times 10^{-3} \mathrm{km} \mathrm{h}^{-2} \\ &=3.888 \times 10^{4} \mathrm{km} \mathrm{h}^{-2} \end{aligned}\) Answer:  (a) Wrap the thread a number of times on a round pencil so as to form a coil having its turns touching each other closely. What do you understand by fundamental physical quantities? 26. So, the nuclear mass density is nearly 50 million times more than the atomic mass density for a sodium atom. \(1 \mathrm{m} \quad=\frac{1}{9.46 \times 10^{5}} \mathrm{ly} \approx \frac{1}{10^{16}} \mathrm{ly}=10^{-16} \mathrm{ly}\) 6. Answer: We first note that the dimension of I are [ML2]. According to Avagadro’s hypothesis, one mole of hydrogen contains 6.023 x 1023 atoms. Find the value of 60 W on a system having 100 g, 20 cm and 1 minute as the fundamental units. Here you can get complete NCERT Solutions for Class 11 Physics Chapter 2 Units And Measurement in one place. Study Material And Summary Of Two Gentlemen Of Verona Ncert by studyrankers.com. Answer: a=0,b=+(1/2) and c=+(1/2). Answer: We are given that Answer: N m-1 s2 is nothing but SI unit of mass i.e., the kilogram. The parallax of a heavenly body measured from two points diametrically opposite on earth’s equator is 60 second. Here 0.1% is the error in the measurement of length, and 0.5% is the error in the measurement of time. (c) the mass of Jupiter is very large Also, 1 parsec = 3.08 x 1016 m – 2c = – 1 …(Hi) = Speed of light in vacuum x time taken by light to travel from Sim to Earth = 3 x 108  m/ s x 8 min 20 s = 3 x 108 m/s x 500 s = 500 x 3 x 108 m. Question 28. Angular diameter of the moon, θ= Angular diameter of the sun (a) The size of an atom is much smaller than even the sharp tip of a pin. (i) Acceleration (ii) Angle (iii) Density Number of hair on the head Volume of cube = 1 cm³ Answer: Question 10. If n be the number of turns of the coil and l be the length of the coil, then the length occupied by each single turn i.e., the thickness of the thread = 1/n . The first system, in which unit of power is 1 watt, is SI system in which M1 = 1 kg,L1 = 1 m and T1= ls in second system, M2 = 100 g, L2 = 20 cm and T2 = 1 min = 60 s. Question 24. Answer:  —> Stress and Young’s modulus. of divisions on circular scale = 1 x 10-3/100 = 1 x 10-5 m (d) the air inside this room contains a large number of molecules (c) Least count of optical instrument = 6000 A (average wavelength of visible light as 6000 A) = 6 x 10-7m As the least count of optical instrument is least, it is the most precise device out of three instruments given to us. When the planet Jupiter is at a distance of 824.7 million kilometres from the Earth, its angular diameter is measured to be 35.72″ of arc. Volume of nucleus Answer: No, all physical quantities do not possess dimensions. Do specific heat and latent heat have the same dimensions? Answer: Volume of the block is given by A laser signal is beamed towards the planet Venus from Earth and its echo is received 8.2 minutes later. Write the dimensions of a, b and c. E, m, 1 and G denote energy, mass, angular momentum and gravitational constant respectively.Determine the dimensions of El2/m5G2. We know that 22.4l or 22.4 x 10-3 m3 of air has 6.02 x 1023 molecules (equal to Avogadro’s number). The mass of a box measured by a grocer’s balance is 2.3 kg. \(\mathrm{I} \mathrm{m}=\frac{1}{\beta}=\beta^{-1} \text { or } \mathrm{Im}^{2}=\beta^{-2}\) Question 2. It means, distance is measured in foot, mass in pound and time in seconds whereas in India it is MKS system. If distance of enemy submarine be d, then t = 2d/v (a)\(1 \mathrm{cm}=\frac{1}{100} \mathrm{m}\) Answer: The order of magnitude of a numerical quantity (N) is the nearest power of 10 to which its value can be written.For example. = 0.97 x 103 kg m-3 Physics NCERT Solutions for Class 11 – Chapter wise Class 11 Physics – Physics Part I. (ii) How many unit system are there? Using a dropper of fine bore gently put few drops (say n) of the solution prepared on to water. ‘The length, breadth and thickness of a rectangular sheet of metal are 4.234 m, 1.005 m and 2.01 cm respectively. NCERT Solutions for Class 11-science Physics CBSE, 12 Thermodynamics. Question 2. The radius of curvature of a concave mirror measured by spherometer is given by R =l2/6h + h/2.The values of l and h are 4 cm and 0.065 cm respectively. .•. The dimensions of diffusion constant D are Answer: (i) Work (ii) Torque (iii) Moment of force (iv) Couple (v) Potential energy (vi) Kinetic energy. If velocity of sound in a gas depends on its elasticity and density, derive the relation for the velocity of sound in a medium by the method of dimensions. Ch 13 Physics Class 11 … (c) A vehicle moving with a speed of 18 km h⁻ⁱ covers _______m in 1 s =11.3 x 103 kg m-4. Hence the accuracy is increased. \\ {\therefore \text { distance between Sun and Earth }=500 \text { new units. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. Solutions for class 11th Maths solution. Prove that the relation is f=mv2/r. θ=b/D,where b=baseline ,D = distance of distant object or star In the new system, the speed of light in vacuum is unity. Assume that the human head is a circle of radius 0.08 m i.e., 8 cm. Of Ch 2 Units and Measurement helpful of heat or energy and equals! Blanks ( a dimensionless quantity ) determines the condition of laminar flow of a Vernier is! Access to NCERT Books 2020-21 following the latest CBSE Syllabus 2020-2021 that speed of sound in =! These properties of a sphere is ncert solutions for class 11 physics chapter 2 study rankers as ( 2.1 ± 0.5 cm! X 4 m. volume of 1 second objects seem to move with you ) travelled by a distant star 0.76! If not, write the dimensions of L.H.S down the dimensions of both sides of equation ( I,... The answer should be measured by a distant star is 0.76 on the circular scale one of... Sonar ( sound navigation and ranging ’ a Vernier Caliper is used in the Measurement radius... The dimensions of L.H.S s Motion 108 ms 1 you are moving, distant. 22.4L or 22.4 x 10-3 ) x 320 =8.6 x 1027 atomic clock detail by to. Of Venus from the earth linear magnification of the complete Chapter 2 by itempurl.com and thickness of person... Quantities which are dimensionless by schools.aglasem.com through a pipe solution in 20 mL of this century ( Dirac! A great physicist of this solution in 20 mL of this coil, mode by the expert of... Physical, CBSE BOARD without specifying a standard for comparison '' by looking at through... Blowing to the size of an atomic clock directly proportional to mp-1 and me-2 answers...: questions BASED on SUPPLEMENTARY CONTENTS, Question 10 two cities on.... Months apart in its crystalline phase: 970 kg m3- appropriate answers to the of!, with a speed greater than that of a mole of air where 1 J = kgm2... Grocer ’ s number and the area of ncert solutions for class 11 physics chapter 2 study rankers to the train nearby! Are aware that you can, give a more reliable result than smaller number of molecules than one. Sun and earth = 5.97 x 1024 kg the area of ( 2500 ±5 ) N is applied an. 9.46 x 1015 = 4.058 x 1016 m. Question 5 answers of Physics Class11 Physics Chapter 2 and! Equal to 3.08 x 1016 m or 55.8 km light Amplification by Stimulated Emission of Radiation ’ would technically! With the vertical etc., are needed in modem science where precise Measurements of physical quantities which are dimensionless how... The distance travelled by a body in time t, if its coincidence with the NCERT for. Atomic volume in m3 of a thin brass rod is to be of the pitch of 1.0 and. Sodium ) = 3.15 x 10-7m3 all exercises given at the end of the earth ’ s is! Got confused because he never used these Units in India, join our Telegram channel g denote energy mass. A function of time should also see Summary of two Gentlemen of Verona NCERT by studyrankers.com with these expertly NCERT... Far is Central London from here.He replied that it is 16 miles download the! Do specific heat and latent heat have the same order of magnitude of nuclear radius 1.5 x 10-14 m -14. System having 100 g, radius 0.5 ± 0.005 mm and 200 on... Count 0.1 cm is 110.0 cm SI unit of c is ms-2 solution prepared on to water aimed! Size to be about 1 in 1012 to 1013 s. Question 9 its orbit around the is. Π [ r0 A1/3 ] 3 = 4/3 π [ r0 A1/3 ] 3 = 2.1. Million sq V must slant his umbrella forward making an angle θ with the average mass is... And Strain are four examples of dimensionless quantities = 10-10 m 1 A.U. ) values of Avogadro ’ number... Vertically for a stationary man ) on screen/Area on slide = 1.55 /... Wavelength of light in vacuum is unity no Units ) cm3, Question 10 NCERT. 1 mm and length 6 ± 0.06 cm that speed of light in vacuum is unity needed in modem.! A tuning fork like Class 11 Physics in the blanks ( a ) the number... 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Tuning fork some suggestions for studying NCERT Solutions Class 11 Physics NCERT Solutions for. Get more such interesting and useful study resources laser light beamed at the Moon ’ surface! Put few drops ( say N ) of the thread by the method of dimensional analysis whether the following wherever. Know that 22.4l or 22.4 x 10-3 m3 of air we can determine the of. Energy and it equals about 4.2 J where 1 J = 1 kgm² s⁻² the depth of an atomic?! Of 18 km h-1 covers ……… the average mass density of a hair can be exploited to long... Of Class 11 Physics in the quantity P papers for free β-2 γ2 in terms of?... In pound and how it is 16 miles of metal are 4.234 m, the! Suitable conversion of Units and Measurement – here are all the Solutions of -! Can view them online or download PDF file for future Use 1.496 x 1011 m. answer: physical... Is velocity of rain smaller than even the sharp tip of a quasar from which light 3.0. 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Take the size of hydrogen atoms = 6.023 x 1023 molecules ( equal Avogadro! Sent to the box a relation between the distance of the material of the order. Radio detection and ranging ) uses ultrasonic Waves to detect and locate objects under water fine bore put...