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Q.

In the photoelectric experiment ,if we use a monochromatic light the I-V curve is as shown . if work function of the metal is $2 e V$ estimate the power of light used .(Assume efficiency of photo emission $= 10^{- 3} %$ , I.e number of photoelectrons emitted are $= 10^{- 3} %$ of numbers of photons incident on metal )
(Note; The answer should be W)

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answer is 7.

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Detailed Solution

From graph
Stopping potential is $V_{s} = - 5 V$
$∴ E = E + e V s ∴ E = 2 e V + 5 e V = 7 W$

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In the photoelectric experiment ,if we use a monochromatic light the I-V curve is as shown . if work function of the metal is 2 eV estimate the power of light used .(Assume efficiency of photo emission =10−3%, I.e number of photoelectrons emitted are =10−3% of numbers of photons incident on metal ) (Note; The answer should be W)