JEE · NEET Previous Year Question
A photoelectric surface is illuminated successively by monochromatic light of wavelength λ 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 of the material is ( Planck's constant, speed of light)
Topic: NEET PYQ
Answer: A. Full step-by-step solution below.
- A
- B
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Correct answer: A
Solution
(a) According to Einstein's photoelectric equation,……..(i)
Similarly, in second case, maximum kinetic energy of emitted electron is 3 times that in first case, we get
……..(ii)
Solving Eqs. (i) and (ii), we get work function of an emitted electron from a metal surface.
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