A beam of ligh incident on a surface has photons each of energy 1 mJ and intensity `25w//cm^(2)`. Find number of photons incident per second if surface area of `25cm^(2)`

Monochromatic light of wavelength 3000 Å is incident normally on a surface of area 4 cm^(2) If the intensity of light is 150 (m W)/(m^(2)) , the number of photon being incident on this surface in one second is ……

A ray of light of frequency 5000 Å is incident on a metal surface and thus, absorbs 10^(-7)J of energy. Calculate the number of photons incident on the metal surface.

A beam of light having wavelength lambda and intensity 1 falls normally on an area A of a clean surface then find out the number of photon incident on the surface.

A parallel beam of monochromatic light of wavelength 500nm is incident normally on a perfectly absorbing surface. The power through any cross- section of the beam is 10 W. Find (a) the number of photons absorbed per second by the surface and (b) the force exerted by the light beam on the surface.

A parellel beam of monochromatic light of wavelength 500 nm is incident normally on a perfectly absorbing surface. The power through any cross section of the beam is 10 W. Find (a) the number of photons absorbed per second by the surface and (b) the force exerted by the light beam on the surface.

A parellel beam of monochromatic light of wavelength 500 nm is incident normally on a perfectly absorbing surface. The power through any cross section of the beam is 10 W. Find (a) the number of photons absorbed per second by the surface and (b) the force exerted by the light beam on the surface.

A parallel beam of monochromatic light of wavelength 500nm is incident normally on a perfectly absorbing surface. The power through any cross- section of the beam is 10 W. Find (a) the number of photons absorbed per second by the surface and (b) the force exerted by the light beam on the surface.