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CBSE XII
>>
Physics
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Dual nature of radiation and matter
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Q)
Light of frequency
7.21
×
10
14
H
z
is incident on a metal surface . Electron with a maximum speed of
6.0
×
10
5
m
s
−
1
are ejected from the surface. What is the threshold frequency for photo emission of electron ?
h
=
6.63
×
10
−
34
J
s
,
m
e
=
9.1
×
10
−
31
k
g
4.74
×
10
15
H
z
4.74
×
10
15
K
H
z
4.74
×
10
14
H
z
4.74
×
10
14
k
H
z
Share
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