First slide

Electromagnetic waves and its nature

Question

The sun delivers $10^{3} W / m^{2}$ of electromagnetic flux to the earth’s surface. The total power that is incident on a roof of dimensions $8 m \times 20 m$ is $1.6 \times 10^{5} W$ , then the radiation force on the roof will be

Moderate

A

$1.33 \times 10^{- 3} N$
B

$2.3 \times 10^{- 3} N$
C

$8.53 \times 10^{- 5} N$
D

$5.33 \times 10^{- 4} N$

Solution

The radiation force,
$F=Radiation Pressure ×Area =PA = \frac{I}{c} A \Rightarrow F= \frac{10^{3} \times 8 \times 20}{3 \times 10^{8}} = 5.33 \times 10^{- 4} N$

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