The cathode of a photoelectric cell is change | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The photoelectric current in a cell depends on the number of photoelectrons emitted per unit time.This number is directly proportional to the inte

Vedclass · Accepted Answer

$I_1 = I_2$

Vedclass · Answer

(A) The photoelectric current in a cell depends on the number of photoelectrons emitted per unit time.This number is directly proportional to the intensity of the incident light,provided the frequency of the incident light is greater than the threshold frequency $(h
u > W)$.The work function $(W)$ determines the threshold frequency $(W = h
u_0)$,but it does not affect the number of photoelectrons emitted for a given intensity of light.Since the intensity of the incident light remains unchanged and the condition $h
u > W_2$ is satisfied,the number of photoelectrons emitted per unit time remains the same.Therefore,the photoelectric current remains unchanged,i.e.,$I_1 = I_2$.

The cathode of a photoelectric cell is changed such that the work function changes from $W_1$ to $W_2$ $(W_2 > W_1)$. If the current before and after change are $I_1$ and $I_2$,all other conditions remaining unchanged,then (assuming $h\nu > W_2$):

Similar Questions

Light with a frequency of $1.5$ times the threshold frequency is incident on a photosensitive material. If the frequency is halved and the intensity is doubled,what will be the photoelectric current?

$A$ photocell is illuminated by a small bright source placed $d \; m$ away. When the same source of light is placed $\frac{d}{2} \; m$ away,the number of electrons emitted by the photocathode would

Threshold frequency for a metal is $10^{15} \ Hz$. Light of $\lambda = 4000 \ \mathring{A}$ falls on its surface. Which of the following statements is correct?

When yellow light is incident on a surface,no electrons are emitted,while green light can emit them. If red light is incident on the surface,then:

Give an outline of the experimental study of the photoelectric effect.

Vedclass Test Series

Exam Paper Generator

Online Exam Module