Physics Test 14...

Two gases A and B are contained in the same vessel which is at temperature T. The number of molecules of gas A is N and mass of each molecule is m. The number of molecules of gas B is 2N and mass of its each molecule is 2m. If mean square velocity of molecules of gas B is v² and mean square velocity of x component of velocity of molecules of gas A is 

The energy spectrum of a black body exhibits a maximum around a wavelength λ₀. The temperature of the black  body is now changed such that the energy is maximum around a 3λ₀/4 wavelength. The power radiated by the black body will now increases by factor :-

A particle moves a distance x in time t according to equation x = (t + 5)^–1. The acceleration of particle is proportional to :-

A body, under the action of a force  acquires an acceleration of 1m/s². The mass of this body must be :-

A body of mass 0.01 kg starts to move in a viscous liquid with initial velocity 5 m/s. If drag force is 10–3 N then find time after which velocity will become 1/10 m/s

A body of mass 1 kg begins to move under the action of a time dependent force are unit vectors along x and y axis. What power will be developed by the force at the time t ?

When monochromatic light falls on a photosensitive material, the number of photo-electrons emitted per second is n and their maximum kinetic energy is (E_k)_max. If the intensity of the incident light is doubled, then :

The potential energy of a particle of mass m is given by  U(x) =   λ₁ and λ₂ are the de-Broglie wavelengths of the particle, when 0 ≤ x ≤ 1 and x > 1 respectively. If the total energy of particle is 2E₀, the ratio  will be :- 

A radioactive substance emits n beta particles in the first 2 seconds and 0.5 n beta particles in the next 2 seconds. Then mean life of the sample is

When a radioactive nucleus ₉₀Th²³⁸ changes into ₈₆Rn²²², then the  number of emitted α and β particles are :-