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VITEEE 2010 Solved Paper
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© examsnet.com
Question : 22
Total: 120
The maximum velocity of electrons emitted from a metal surface is v, when frequency of light falling on it is f. The maximum velocity when frequency becomes 4f is
2v
> 2v
< 2v
between 2v and 4v
Validate
Solution:
According to Einstein's photoelectric equation,
E
=
W
0
+
1
2
m
v
2
max
⇒
v
max
=
√
2
(
hf
−
W
0
)
m
If frequency becomes 4f then
v
′
=
√
2
(
h
×
4
f
−
W
0
)
m
=
2
√
2
(
hf
−
W
0
4
)
m
⇒
v
′
>
2
v
© examsnet.com
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