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KEAM 2010 Physics and Chemistry Paper
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© examsnet.com
Question : 14
Total: 119
In the total electromagnetic energy falling on a surface is U, then the total momentum delivered (for complete absorption) is
U
c
cU
U
c
2
c^2U
√
U
c
Validate
Solution:
The object gains an energy
∆
U
from radiation. Maxwell showed that the object also gains linear momentum, the magnitude
∆
p
or the change in momentum of the object is related to the energy change
U
by
∆
p
=
U
c
© examsnet.com
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