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Standard IX
Physics
Reflection of Light by Other Media
Why radiation...
Question
Why radiation pressure during complete absorption is I/c while during complete reflection it is 2I/c ??
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Q.
For the oblique incidence and complete absorption, if angle
θ
is increased then radiation pressure -
Q.
Light with an energy flux of 20 W/
c
m
2
falls on a non-reflecting surface at normal incidence. If the surface has an area of 30
c
m
2
, the total momentum delivered (for complete absorption) during 30 minutes is :
Q.
If
2.5
×
10
−
6
N
average force is exerted by a light wave on a non-reflecting surface of area
30
cm
2
during
40
minutes of time span, the energy flux of light just before it falls on the surface is ______
W/cm
2
.
(
Round off to the nearest integer
)
(
Assume complete absorption and normal incidence conditions are there
)
Q.
For complete absorption, which of the following is true?
a
→
Absorptive power
r
→
Reflective power
Q.
During secondary growth, a complete ring is formed by
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