When light of wavelength 2480 A0 is incident on a metal surface electrons are emitted with a maximum KE of 2 eV. The maximum KE of photo-electrons, if light of wavelength 1240 A0 is incident on the same surface would be
2eV
4eV
7eV
1 eV
A
4eV
B
7eV
C
2eV
D
1 eV
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Solution
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From the 1st condition hCλ−W=2eV
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