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In a photoelectric experiment, the wavel...

In a photoelectric experiment, the wavelength of the light incident on a metal is changed from 300 nm to 400 nm. Choose the closest value of change in the stopping potential from given options `((hc)/(e)=1240 nm.V)`

A

2.0 V

B

0.5 V

C

1.0 V

D

1.5 V

Text Solution

Verified by Experts

The correct Answer is:
C
`V_(s_(1))=1240/300 -phi/e " " [ :. eV = E -phi] `
`V_(s_(2)) = 1240/(400) -phi/e`
`V_(s_(1)) -V_(s_(2)) = 1240/300 - 1240/400`
`rArr 4.13 - 3.1 = 1.03 approx 1 `
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