A parallel beam of light of intensity `I` and cross section area `S` is incident on a plate at normal incidence. The photoelectric emission efficiency is `100%`, the frequency of beam is `v` and the work function of the plate is `phi(hv gt phi)`. Assuming all the electrons are ejected normal to the plane and with same maximum possible speed. The net force exerted on the plate only due to striking of photons and subsequent emission of electrons is

Light of intensity I and frequency v is incident on a photossensitive surface and causes photoelectric emission. Justify with the help of graph, the effect on photoelectric current when the frequency of incident radiation is increased all other factors remain the same.

Light of intensity I and frequency v is incident on a photossensitive surface and causes photoelectric emission. Justify with the help of graph, the effect on photoelectric current when the anode potential is increased In each case, all other factors remain the same.

In a photoelectric experiment a parallel beam of monochromatic light with power of 200 is incident on a perfectly absorbing cathode of work function 6.25. The frequency of light is just above the threshold frequency so that the photoelectrons are emitted with negligible kinetic energy. Assume that the photoelectron emission efficiency is 100%. A potential difference of 500 is applied between the cathode and the anode. All the emitted electrons are incident normally on the anode and are absorbed. The anode experiences a force 10 due to the impact of the electrons. The value of is __________. Mass of the electron 910 and 1.01.610.

If the work function of a metal is 'phi' and the frequency of the incident light is 'v' , there is no emission of photoelectron if

If a parallel beam of light having intensity I is incident normally on a perfectly reflecting surface, the force exerted on the surface, equal F. When the surface is held at an angle theta , the force is