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Q.

For photoelectric emission from certain metal the cutoff frequency is υ . If radiation of frequency 2υ impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)

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a

2hυm

b

hυm

c

hυ2m

d

hυ1m

answer is A.

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Detailed Solution

Work function, ϕ=hνAccording to Einstein's photoelectric equation12mvmax2=h2ν−hν 12mvmax2=hν vmax2=2hνm vmax=2hνm

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For photoelectric emission from certain metal the cutoff frequency is υ . If radiation of frequency 2υ impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)