Physics Test - ...

At Kavalur in India, the astronomers using a telescope whose objective and a diameter of one metre started using a telescope of diameter 2.54 m this resulted in _______

Which among the following statements is true about Huygen's principle?

A photon of energy hν is absorbed by a free electron of a metal having work function ϕ < hv. Then:

When heat radiation falls on a surface, then it:

An electron is moving in a circular orbit in a magnetic field of \(2 \times 10^{-4}\) weber/m\(^{2}\). Its time period of revolution is:

The focal lengths of objective and eyepiece of a telescope is 20 cm and 4 cm respectively. Find the magnification produced by the telescope.

An electric dipole, when held at \(30^{\circ}\) with respect to a uniform electric field of \(10^{4} {~N} / {C}\) experiences a torque of \(9 \times 10^{-26} {Nm}\). Calculate the dipole moment of the dipole.

Choose the correct graph of photo current versus applied voltage in reverse bias in case of a photodiode:

Which of the following force does not follow the inverse square law?

When the momentum of a proton is changed by an amount \(\Delta\mathrm{p}\), then the corresponding change in the de-Broglie wavelength is found to be 0.20%. The original momentum of the proton was: