Kinetic energy with which the electrons are emitted from the metal surface due to photoelectric effect is
Independent of the intensity of illumination
Independent of the frequency of light
Inversely proportional to the intensity of illumination
Directly proportional to the intensity of illumination
When light falls on a metal surface, the maximum kinetic energy of the emitted photo-electrons depends upon
The momentum of a photon in an $X-$ ray beam of ${10^{ - 10}}$ metre wavelength is
If $5\%$ of the energy supplied to a bulb is irradiated as visible light, how many quanta are emitted per sec by a $100$ $watt$ lamp ? Assume wavelength of visible light as $5.6\times10^{-5}\, cm$.
A $160 \,W$ infrared source is radiating light of wavelength $50000 \,\mathring A$ uniformly in all directions. The photon flux at a distance of $1.8 \,m$ is the order of ............. $m^{-2} s ^{-1}$
A radiation of energy $'E'$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is $( C =$ Velocity of light $)$