Question 479: Waves

Question

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2 m and 3 m respectively from the source. The ratio of the intensities of the waves at P and Q is

Accepted Answer

d
1
= 2 m, d
2
= 3 m
$$Intensity \propto {1 \over {{{\left( {distance} ight)}^2}}}$$
$${I_1} \propto {1 \over {{2^2}}}$$ and $${I_2} \propto {1 \over {{3^2}}}$$
$$ 	herefore {{{I_1}} \over {{I_2}}} = {9 \over 4}$$

Answer

3 : 2

Answer

2 : 3

Answer

9 : 4

Answer

4 : 9

Waves

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2 m and 3 m respectively from the source. The ratio of the intensities of the waves at P and Q is

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