4.
In photoelectric effect, the number of photoelectrons emitted per second is proportional to-
5.
A proton and an alpha particle have the same kinetic energy. The ratio of de-Broglie wavelengths associated with the proton to that with the alpha particle is-
6.
The photoelectric emission occurs-
7.
Photons of energy 3.2 eV are incident on a photosensitive surface. If the stopping potential for the emitted electrons is 1.5 V, the work function for the surface is-
10.
A photon of wavelength 663 nm is incident on a metal surface. The work function of the metal is 1.5 eV. The maximum kinetic energy of the emitted photo electrons is-
(A) 3 x 10-20 J
(B) 6 x 10-20 J
(C) 4.5 x 10-20 J
(D) 9 x 10-20 J
