The charge on gamma rays is

Assertion : Absorption spectrum consists of some bright lines separated by dark spaces.
Reason : Emission spectrum consists of dark lines.

$750$ waves of an electromagnetic radiation pass a point in one minute. What is the wavelength of the radiation?

Describe the electromagnetic spectrum.

$A$ magnet will cause the greatest deflection of

$A$ photon-sensitive metal is not emitting photoelectrons when irradiated. It will do so when the threshold is crossed. To cross the threshold,we need to increase: