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Stopping Potential

The photoelec...

Question

The photoelectric work function of copper is 4.47 eV.The maximum potential upto which a copper ball remote from all other bodies, will be changed when irradiated by light of wavelength 140 nm is:

A

4.37V

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B

4.23V

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C

8.70V

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D

8.46V

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Solution

The correct option is A 4.37V
Stopping potential $= (\frac{h c}{λ} - ϕ) / e$

$= (\frac{1240}{140} - 4.47) / e (h c = 1240 e V - n m)$

$= (8.86 - 4.47) / e$
$= 4.37 e V / e$
$= 4.37 V$
So, the answer is option (A).

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