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NEET 2018 Physics and Chemistry
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© examsnet.com
Question : 22
Total: 90
When the light of frequency
2
v
0
(where
v
0
is) threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is
v
1
.when the frequency of the incident radiation is increased to
5
v
0
, the maximum velocity of electrons emitted from the same plate is
v
2
.The ration
v
1
to
v
2
is
[NEET 2018]
1
:
2
1
:
4
2
:
1
4
:
1
Validate
Solution:
👈: Video Solution
E
=
W
0
+
1
2
m
v
2
h
(
2
v
0
)
=
h
v
0
+
1
2
m
v
1
2
h
v
0
=
1
2
m
v
1
2
..........(i)
h
(
5
v
0
)
=
h
v
0
+
1
2
m
v
2
2
4
h
v
0
=
1
2
m
v
2
2
...(ii)
Divide by (i) and (ii)
1
4
=
v
1
2
v
2
2
v
1
v
2
=
1
2
© examsnet.com
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