Dual Nature of Radiation and Matter - Result Question 54

58. The photoelectric work function for a metal surface is 4.125eV. The cut off wavelength for this surface is

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======= ####58. The photoelectric work function for a metal surface is 4.125eV. The cut off wavelength for this surface is

c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) 4125\AA

(c) 6000\AA

(b) 3000\AA

(d) 2062.5\AA

[1999]

Show Answer

Answer:

Correct Answer: 58. (b)

Solution:

  1. (b) Let λ0 be cut off wavelength.

Work function =hcλ0=4.125×1.6×10−19

λ0=6.626×10−34×3×1084.125×1.6×10−19=3000\AA

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