First slide

Intensity of

Question

The displacement Vs time graph for two waves A and B which travel along the same string are shown in the figure. Their intensity ratio $l_{A} / l_{B}$ is

Moderate

A

$\frac{9}{4}$
B

1
C

$\frac{81}{16}$
D

$\frac{3}{2}$

Solution

$\frac{l_{1}}{l_{2}} = \frac{a_{1}^{2} f_{1}^{2}}{a_{2}^{2} f_{2}^{2}} = \frac{{(3)}^{2} {(8)}^{2}}{{(2)}^{2} {(12)}^{2}} = 1$

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