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Byju's Answer
Standard XII
Physics
The Photon Model
In photo elec...
Question
In photo electric effect, the threshold wavelength of sodium is 5000 Å. Find its work function
(
h
=
6.6
×
10
−
34
J
s
,
c
=
3
×
10
8
m
s
−
1
,
1
e
V
=
1.6
×
10
−
19
J
)
A
7.5 eV
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B
2.5 eV
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C
10 eV
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D
5 eV
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Solution
The correct option is
B
2.5 eV
λ
0
=
5
×
10
−
7
m
w
=
h
c
λ
0
=
12400
5000
=
2.5
e
V
Suggest Corrections
0
Similar questions
Q.
In photo electric effect, the threshold wavelength of sodium is 5000 Å. Find its work function
(
h
=
6.6
×
10
−
34
J
s
,
c
=
3
×
10
8
m
s
−
1
,
1
e
V
=
1.6
×
10
−
19
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)
Q.
In photoelectric effect, the threshold wavelength of sodium is 5000 A. Find its work function.
(
h
=
6.6
×
10
−
34
J
s
,
c
=
3
×
10
8
⋅
m
s
−
1
,
1
e
V
=
1.6
×
10
−
19
J
)
Q.
The work function of Potassium is
2.0
e
V
. When it is illuminated by light of wavelength
3300
A
o
, photoelectrons are emitted. The stopping potential of photoelectrons is :
[
h
=
6.6
×
10
−
34
J
s
,
1
e
V
=
1.6
×
10
−
19
J
, Velocity of light,
c
=
3
×
10
8
m
s
−
1
]
Q.
The photo-electric threshold wavelength for a metal is 6620
A
o
. Its work function is (given
h
=
6.62
×
10
−
34
J
s
,
c
=
3
×
10
8
m/s)
Q.
The work function of sodium is 2.46eV and its threshold wavelength is
5040
A
∘
. Then the value of universal plank’s constant is (given
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=
3
×
10
8
m
/
s
)
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