The necessary condition for photoelectric emission is :
hν<hν0
hν>hν0
Ek>hν0
Er<hν0
A
hν<hν0
B
hν>hν0
C
Er<hν0
D
Ek>hν0
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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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