JEE Main 2016 Physics question
A photoelectric surface is illuminated successively by monochromatic light of wavelengths and . If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface is :
Answer: (1)
Solution
Write Einstein's photoelectric equation for the two cases, with the maximum kinetic energy in the first:
= φ + K, = φ + 3K.
Subtracting the first from the second eliminates the work function:
= 2K ⇒
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