Question

14. A photo electric emitter has a threshold frequency
V, When light of frequency 20, is incident, the
speed of photo electrons is V. When light of
frequency 5v, is incident, the speed of photo
electrons will be
A) 4V B) 2V C) 2.5V
D) 2.5V​

Answer 1

Answer:

4v. = a is a correct answer of the question

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