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Question

The necessary condition for photoelectric emission is :
  1. hν<hν0
  2. hν>hν0
  3. Ek>hν0
  4. Er<hν0

A
hν<hν0
B
hν>hν0
C
Er<hν0
D
Ek>hν0
Solution
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Light with frequencies below a certain cutoff value, called the threshold frequency, would not eject photoelectrons from the metal surface no matter how bright the source is.
Hence hν>hνo

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