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Which radiations will be most effective for the emission of electrons from a metallic surface?

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in Physics – Class 12 by (135k points)
Which radiations will be most effective for the emission of electrons from a metallic surface?

(a) Microwaves

(b) X rays

(c) Ultraviolet

(d) Infrared

The question was asked in exam.

My doubt is from Photoelectric Effect in section Dual Nature of Radiation and Matter of Physics – Class 12

1 Answer

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Best answer
The correct answer is (c) Ultraviolet

The best explanation: Ultraviolet rays are most effective for photoelectric emission because they have the highest frequency when compared to the other electromagnetic waves, and hence the most energetic among all of them.

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