Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material, photoelectric current is emitted. If the frequency of light is halved and intensity is doubled, the photoelectric current becomes

Question

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material, photoelectric current is emitted. If the frequency of light is halved and intensity is doubled, the photoelectric current becomes (A) 4 times the orginal current (B) 2 times the original current (C) half the original current (D) zero times the original current

Tardigrade Admin · Accepted Answer

v1=1.5v0 v2=(v1/2)=0.75v0 < v0 ⇒ photoelectric effect (P.E.E.) not possible.

Q. Light of frequency $1.5$ times the threshold frequency is incident on a photosensitive material, photoelectric current is emitted. If the frequency of light is halved and intensity is doubled, the photoelectric current becomes

$4$ times the orginal current

$2$ times the original current

half the original current

zero times the original current

$v_{1} = 1.5 v_{0}$
$v_{2} = \frac{v _{1}}{2} = 0.75 v_{0} < v_{0}$
$\Rightarrow$ photoelectric effect (P.E.E.) not possible.

Q. Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material, photoelectric current is emitted. If the frequency of light is halved and intensity is doubled, the photoelectric current becomes

4 times the orginal current

2 times the original current