Physics Test - ...

The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refractive index n), is

White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains.

The coefficient of linear expansions of brass and steel are α₁ and α₂ respectively. When we take a brass rod of length ℓ₁ and a steel rod of length ℓ₂ at 0 ^oC, then the difference in their lengths (ℓ₂ - ℓ₁)will remain the same at all temperatures if

Power applied to a particle varies with time as P=(3t² –2t + 1) watts, where  is time in seconds. Then the change in kinetic energy between time t=2 s to t = 4 s is-

The element used for radioactive carbon dating for more than 56000 yr is

A uniform wire of resistance $36\mathrm{}\mathrm{\Omega }$ is bent in the form of a circle. The effective resistance between A and B is (O is the centre of circle):

There is a 5 Ω resistance in an AC circuit. Inductance of 0.1 H is connected with it in series. If equation of AC e.m.f. is 5sin 50t then the phase difference between current and e.m.f. is

An electron moves with a speed of \(\frac{\sqrt{3}}{2}\)c. Then its mass becomes__________ times its rest mass. (Given velocityof light =c )

Assuming the sun to be a spherical body of radius $R$ at a temperature of $T\mathrm{K}$, evaluate the total radiant power, incident on earth, at a distance r from the sun

Where r_o is the radius of the earth and $\sigma$ is stefan's constant.