Physics Test - ...

If the mirror of a periscope is replaced by lenses then which of the following phenomenon will occur to operate the periscope properly?

The time required for the light to pass through a glass slab (refractive index \(=1.5)\) of thickness \(4\) mm is ________ \(( c =3 \times 10^{8}\) ms\(^{-1}\), speed of light in free space).

Two photons of same frequency are produced due to the annhiliation of a proton and antiproton. Wave length of the proton so produced is:

In case of steady electric field in between region of the parallel plate capacitor. The magnitude of displacement current is:

What happens to the strength of electromagnet if the soft iron core is put into it?

The optical element used to split a poly-chromatic light into its constituent component colors is called:

What is the dimensional formula for \(\epsilon_{0}\)?

The output of a NOR gate is high if ______.

\(1 kWh =\) ______ \(J\)

The surface of a metal is illuminated with the light of \(400 \mathrm{~nm}\). The kinetic energy of the ejected photoelectrons was found to be \(1.68 \mathrm{eV}\). The work function of the metal is: \((h c=1240 \mathrm{eV} \mathrm{nm})\)