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It is claimed that two cesium clocks, if allowed to run for 100 years, free from any disturbance, may differ by only about 0.02 s. What does this imply for the accuracy of the standard cesium clock in measuring a time-interval of 1 s

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Estimate the average mass density of a sodium atom assuming its size to be about 2.5 Å. (Use the known values of Avogadro’s number and the atomic mass of sodium). Compare it with the density of sodium in its crystalline phase : 970 kg `m^(–3)`. Are the two densities of the same order of magnitude ? If so, why

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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The unit of length convenient on the nuclear scale is a fermi : 1 f = `10^(–15)` m. Nuclear sizes obey roughly the following empirical relation : `r=r_oA^(1/3)` where r is the radius of the nucleus, A its mass number, and `r_o` is a constant equal to about, 1.2 f. Show that the rule implies that nuclear mass density is nearly constant for different nuclei. Estimate the mass density of sodium nucleus. Compare it with the average mass density of a sodium atom obtained in Exercise.

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A LASER is a source of very intense, monochromatic, and unidirectional beam of light. These properties of a laser light can be exploited to measure long distances. The distance of the Moon from the Earth has been already determined very precisely using a laser as a source of light. A laser light beamed at the Moon takes 2.56 s to return after reflection at the Moon’s surface. How much is the radius of the lunar orbit around the Earth

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under water. In a submarine equipped with a SONAR the time delay between generation of a probe wave and the reception of its echo after reflection from an enemy submarine is found to be 77.0 s. What is the distance of the enemy submarine? (Speed of sound in water = 1450 m

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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The farthest objects in our Universe discovered by modern astronomers are so distant that light emitted by them takes billions of years to reach the Earth. These objects (known as quasars) have many puzzling features, which have not yet been satisfactorily explained. What is the distance in km of a quasar from which light takes 3.0 billion years to reach us

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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It is a well known fact that during a total solar eclipse the disk of the moon almost completely covers the disk of the Sun. From this fact and from the information you can gather from examples 2.3 and 2.4, determine the approximate diameter of the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A great physicist of this century (P.A.M. Dirac) loved playing with numerical values of Fundamental constants of nature. This led him to an interesting observation. 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. Further, it was a very large number, its magnitude being close to the present estimate on the age of the universe (~15 billion years). From the table of fundamental constants in this book, try to see if you too can construct

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A book with many printing errors contains four different formulas for the displacement y of a particle undergoing a certain periodic motion : (a) y = a sin 2π t/T (b) y = a sin vt (c) y = (a/T) sin t/a (d) y`(asqrt2)`(sin 2πt/T + cos 2πt/T ) (a = maximum displacement of the particle, v = speed of the particle. T = time-period of motion). Rule out the wrong formulas on dimensional

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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If `x = at + bt^2` where x is in meters and t is in seconds. What are the units of a and

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Fill ups.(i) 3.0m/`s^2 `= ________ km/`hr^2`(ii) `6.67 10^(-11)Nm^2`/`kg^2 = `_________`g^(-1)cm^3s

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Write S.I unit of luminous intensity and

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Calculate the time taken by the light to pass through a nucleus of diameter `1.56 × 10^(-16)` m. (speed of light is `3× 10^8

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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If force (F) acceleration (A) and time (T) are taken as fundamental units, then find the dimension of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Two resistances `R_1 = 100 ± 3Ω and R_2 = 200 ± 4Ω` are connected in series. Then what is the equivalent

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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If velocity, time and force were chosen the basic quantities, find the dimensions of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Young’s modulus of steel is `19× 10^(10) N`/`m^2`. Express it in dynes `cm^2`. Here dynes are the C.G.S unit of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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The velocity υ of water waves may depend on their wavelength λ density of water ρ and the acceleration due to gravity g. Find relation between these quantities by the method of

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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The force acting on an object of mass m traveling at velocity υ in a circle of radius r is giving by `F=(mv^2)/r` The measurements recorded as m `m= 3.5kg +-0.1``υ = 20 m'/'s +-1 m'/'s``' '` `r=12.5m+- 0.5 m` Find the maximum possible (1) fractional error (2) % error in the measurement of force. How will you record the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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What is the difference between `A^o` and

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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