Atomic StructureHard
Question
The pressure exerted by an electromagnetic wave of intensity I (watt/m2) on a non-reflecting surface is :[c is the velocity of light]
Options
A.Ic
B.Ic2
C.I/c
D.I/c2
Solution
Momentum of a
Moment over unit area
Since surface is non reflecting final momentum of photon = 0,
Change in momentum =
So, Force per unit area =
Pressure of radiation =
Moment over unit area
Since surface is non reflecting final momentum of photon = 0,
Change in momentum =
So, Force per unit area =
Pressure of radiation =
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