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VITEEE 2014 Solved Paper
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© examsnet.com
Question : 40
Total: 120
An eye can detect 5 x 104 photons per square meter per sec of green light (λα = 5000 Å) while the ear can detect
10
13
W/
m
2
. The factor by which the eye is more sensitive as a power detector then ear is close to
5
10
10
6
15
Validate
Solution:
Energy =
12375
5000
= 2.475 eV = 4 ×
10
−
19
J
Minimum intensity to which the eye can respond.
I
eye
= (photon flux) x energy of a photon
I
eye
=
(
5
×
10
4
)
× 4 ×
10
−
19
= 2 ×
10
−
14
W/
m
2
Now, lesser the intensity required by a detector for detection more sensitive it will be =
I
ear
I
eye
=
10
−
13
2
×
10
−
14
= 5
© examsnet.com
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