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 and the quantum efficiency of the cathode material.The work function $W$ determines the threshold frequency,but it does not affect the number of photoelectrons emitted for a given intensity of incident light,provided the energy of the incident photons $h
u$ is greater than the work function $(h
u > W)$.Since the intensity of the incident light and all other experimental conditions remain unchanged,the number of photoelectrons emitted per second remains the same.Therefore,the photoelectric current remains constant,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 the change are $I_1$ and $I_2$ respectively,with all other conditions remaining unchanged,then (assuming $h\nu > W_2$):

Similar Questions

The phase difference between input and output voltage of a $CE$ circuit is.......$^o$

On a rainy day,a small oil film on water shows brilliant colours. This is due to

The standard e.m.f. of a cell,involving one electron change is found to be $0.591 \ V$ at $25 \ ^oC$. The equilibrium constant of the reaction is ($F = 96,500 \ C \ mol^{-1}$; $R = 8.314 \ JK^{-1} \ mol^{-1}$)

The $24$ hour (diurnal) rhythm of our body,such as the sleep-wake cycle,is regulated by the hormone:

$A$ steady current flows in a long wire. It is bent into a circular loop of one turn and the magnetic field at the centre of the coil is $B$. If the same wire is bent into a circular loop of $n$ turns,the magnetic field at the centre of the coil is

Vedclass Test Series

Exam Paper Generator

Online Exam Module