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TS EAMCET 18-July-2022 Shift 2 Solved Paper
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© examsnet.com
Question : 115
Total: 160
A beam of white light is incident normally on a plane surface absorbing
70
%
of the light and reflecting the rest. If the incident beam carries
10
W
of power, the force exerted by it on the surface is
3.3
×
10
−
8
N
4.33
×
10
−
8
N
2.3
×
10
−
8
N
3.53
×
10
−
8
N
Validate
Solution:
Given, power of incident beam,
P
=
10
W
Energy of EM wave,
E
=
h
c
λ
or Power or EM wave,
P
=
E
t
=
h
c
λ
t
P
=
h
λ
⋅
(
c
t
)
⋅
⋅
⋅
⋅
⋅
⋅
⋅
(
i
)
But we know that, de-Broglie wavelngth
λ
=
h
p
.
where,
p
=
momentum
⇒
p
=
h
λ
⋅
⋅
⋅
⋅
⋅
⋅
⋅
(
i
i
)
From Eqs. (i) and (ii), we have
P
=
p
c
t
=
p
t
⋅
c
=
F
c
⇒
F
=
P
c
∴
Total effective force
=
F
absorbed
+
F
reflected
=
70
%
of
P
c
+
2
×
30
%
of
P
c
=
0.7
P
c
+
0.6
P
c
=
1.3
P
c
=
1.3
×
10
3
×
10
8
=
4.33
×
10
−
8
N
© examsnet.com
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