In the shown expermiental setup to study photoelectric effect, two conducting electrodes are enclosed in an evacuated glass-tube as shown. A parallel beam of monochromatic light, falls on photosensitive electrodes. The emf of battery shwon is high enough such that all photoelectron ejected from left electrode will reach the right electrode. Under initial conditions photoelectrons are emitted. AS changes are made in each situation of column-I, Match the statements in column-I with results in column-II.

`{:(,"Column I",,"Column II"),((A),"If frequency of incident light is increased keeping its intensity constant",(p),"magnitude of stopping potential"),((B),"If frequency of incident light is increased and its intensity is decreased",(q),"current through circuit may stop"),((C),"If work function of photo sensitive electrode is increased",(r),"maximum kinetic energy of ejected photoelectrons will increase"),((D),"If intensity of incident light is increased keeping its frequency constant",(s),"saturation current will increase"):}`

Answer

(A) p,r (B) p,r (C) q (D) s

Explanation

Consider two equations
`eV_(s)=1/2 mv_(max)^(2)=hv-phi_(0)` …(i)
no. of photoelectrons ejected/ sec `prop ("Intensity")/(hv)` …(ii)
(A) As frequency is increased keeping intensity constant.
`|V_(s)|` will increases, `1/2 m(v_(max)^(2))` will increase.
(B) As frequency is increased and intensity is decreased.
`|V_(s)|` will increase, `1/2 m(v_(max)^(2))` will increase and saturation current will decrease.
(C) Its work function is increased photo emission may stop.
(D) If intensity is increased and frequency is decreased. saturation current will increase.