If in a photoelectric cell , the wavelength of incident light is changed from 4000 Å to 3000 Å then change in stopping potential will be

Options

A. 0.66 V
B. 1.03V
C. 0.33 V
D. 0.49 V

Answer

B

Explanation

Change in stopping potential = `V_(S_2)-V_(S_1)`
`= (hc)/(e) [1/lamda_2 - 1/lamda_1]`
`=(6.6xx10^(-34)xx3xx10^(8))/(1.6 xx10^(-19))[(10^(10))/(3000)-(10^(10))/(4000)] = 1.03 V`