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Q)
When a metal surface is illuminated by a light of wavelength
400
n
m
and
250
n
m
. The maximum velocities of the photo electrons ejected are
v
and
2
v
respectively. The work function of the metal is : (h = Planck's constant, c = velocity of light in air )
( A )
1.5
h
c
×
10
6
J
( B )
h
c
×
10
6
J
( C )
0.5
h
c
×
10
6
J
( D )
2
h
c
×
10
6
J
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