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Standard XII
Physics
Intensity in Photon Model
A sodium lamp...
Question
A sodium lamp emits
3.14
×
10
20
photons per second. Calculate the distance from the sodium lamp where flux of photon is one photon per second per
c
m
2
A
5
c
m
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B
5
×
10
9
c
m
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C
10
c
m
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D
10
7
c
m
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Solution
The correct option is
B
5
×
10
9
c
m
Photon flux at a distance r
n
=
n
o
.
o
f
p
h
o
t
o
n
s
e
m
i
t
t
e
d
p
e
r
s
e
c
4
π
r
2
⇒
1
=
3.14
×
10
20
4
×
3.1
×
r
2
⇒
r
2
=
10
20
4
⇒
r
=
5
×
10
9
c
m
Suggest Corrections
0
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