Monochromatic light of wavelength $3000\mathop A\limits^ \circ$ is incident on a surface area 4 ${\rm{c}}{{\rm{m}}^2}$. If intensity of light is 150mW${{\rm{m}}^{ - 2}}$, then rate at which photones strike the target is

If $V$ be the accelerating voltage, then the maximum frequency of continuous $X$-rays is given by

The colour of the positive column in a gas discharge tube depends on

If the energy of photons corresponding to the wavelength of 6000$\mathop A\limits^ \circ$ is $3.2 imes {10^{ - 19}}$ J, the photon energy for a wavelength of 4000$\mathop A\limits^ \circ$ will be

In Lenard's experiment, if the intensity of the incident light is doubled while keeping the frequency constant, what will be the effect on the stopping potential?

For a body moving with relativistic speed, if the velocity is doubled, then

If a photon has velocity $c$ and frequency $v,$ then which of following represents its wavelength

The magnitude of saturation photoelectric current depends upon

In a photoelectric effect experiment, the slope of the graph between the stopping potential and the incident frequency will be

In cathode ray oscillograph, the focusing of beam on the screen is achieved by

Due to S.C.R. in vacuum tube