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Q.

When a metal plate is exposed to light of wavelength 400 nm, a negative potential of 1.1V is found to be needed to stop the photo current. The threshold wavelength of the photoelectrons is--------nm.

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answer is 620.

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Detailed Solution

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Stopping potential

1.1 Vi.e.,

 Kmax=1.1eVhv=w0+KEmax λ=4000A0

124004000=w0+1.1eV 

w0=2eV λ0=124002=6200A0=620nm

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When a metal plate is exposed to light of wavelength 400 nm, a negative potential of 1.1V is found to be needed to stop the photo current. The threshold wavelength of the photoelectrons is--------nm.