First slide

Average energy density of electromagnetic wave

Question

A plane electro magnetic wave is propagating in vacuum such that average energy density at a point is $5 μ J / m^{3}$ . Then intensity of the wave is

Easy

A

4 $K W / m^{2}$
B

1.5 $K W / m^{2}$
C

2.5 $K W / m^{2}$
D

10 $K W / m^{2}$

Solution

$I = u . C = 5 \times 10^{- 6} \times 3 \times 10^{8} w a l t / m^{2} = 1.5 K W / m^{2}$

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