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Question

# The work function of metal is 1 eV. Light of wavelength 3000˚A is incident on this metal surface. The velocity of emitted photo electrons will be

A
10 m/s
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B
1×103 m/s
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C
1×104 m/s
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D
1×106 m/s
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Solution

## The correct option is D 1×106 m/sEnergy of Light =12400ev.˚A3000˚A∴ Energy of Light =12.43ev∴ Energy of Light =4.133ev∴ Energy of emitted photo electron =4.133−1=3.133ev ∴12mev2e=3.133×1.6×10−19J∴v2e=6.266×1.6×10−199.1×10−31∴v2e=1.10×1012∴ve=106m/sAns :- Velocity of emitted photo electron is 106m/s

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