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Dual Nature of Radiation and Matter
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Photons and Photoelectric Effect
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The work function of a metal is 2.5 eV.
Question
The work function of a metal is 2.5 eV. The maximum kinetic energy of the photoelectrons emitted if a radiation of wavelength 3000
A
o
falls on it is :
(
h
=
6
.
6
3
×
1
0
−
3
4
Js and
c
=
3
×
1
0
8
m/s)
A
1
.
1
2
×
1
0
−
1
9
J
B
4
.
8
×
1
0
−
1
9
J
C
3
.
2
×
1
0
−
1
9
J
D
2
.
6
3
×
1
0
−
1
9
J
Medium
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Updated on : 2022-09-05
Solution
Verified by Toppr
Correct option is D)
Maximum kinetic energy,
K
.
E
.
m
a
x
=
λ
h
c
−
ϕ
=
3
0
0
0
×
1
0
−
1
0
6
.
6
3
×
1
0
−
3
4
×
3
×
1
0
8
−
2
.
5
×
1
.
6
×
1
0
−
1
9
=
(
6
.
6
3
×
1
0
−
1
9
−
4
×
1
0
−
1
9
)
J
=
2
.
6
3
×
1
0
−
1
9
J
.
So, the answer is option (D).
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