Question

# In a photo-emissive cell with exciting wavelength 位, the fastest electron has speed v. If the exciting wavelength is changed to 3位/4 the speed of the fastest emitted electron will be :

A
v(3/4)1/2
B
v(4/3)1/2
C
less than v(4/3)1/2
D
greater than v(4/3)1/2
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