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8.Electromagnetic waves
easy
Radiations of intensity $0.5\,\,W/{m^2}$ are striking a metal plate. The pressure on the plate is
A
$0.166 \times {10^{ - 8}}\,N/{m^2}$
B
$0.332 \times {10^{ - 8}}\,N/{m^2}$
C
$0.111 \times {10^{ - 8}}\,N/{m^2}$
D
$0.083 \times {10^{ - 8}}\,N/{m^2}$
Solution
(a) Intensity or power per unit area of the radiations $P = fv$
==> $f = \frac{P}{v} = \frac{{0.5}}{{3 \times {{10}^8}}} = 0.166 \times {10^{ – 8}}\,N/{m^2}$
Standard 12
Physics
