First slide

Electromagnetic waves and its nature

Question

The average energy flux of sunlight is $1.0 k W m^{- 2}$ . This energy of radiation is falling normally on the metal plate surface of area $10 c m^{2}$ which completely absorbs the energy. The force exerted on the plate if it is exposed to sunlight for 10 minutes is

Moderate

A

$3.3 \times 10^{- 2} N$
B

$3.3 \times 10^{- 9} N$
C

$3.3 \times 10^{- 6} N$
D

$3.3 \times 10^{- 3} N$

Solution

Force on the plate,
$F = P A = \frac{I}{c} A [h e r e P = R a d i a t i o n P r e s s u r e] \Rightarrow F = \frac{1000}{3 \times 10^{8}} \times 10 \times 10^{- 4} = 3.3 \times 10^{- 9} N$

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