First slide

Huygen's Wave Theory

Question

Power of point source is 18 mW. Find the intensity 2.5 m away from the source.

Easy

A

0.23 mW /m²
B

9 mW /m²
C

0.23 W /m²
D

2.88 mW /m²

Solution

$I = \frac{P}{4 {πr}^{2}} ≃ 0.23 mW / m^{2}$

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