Two sound waves of intensity $2 \,W / m ^2$ and $3 \,W / m ^2$ meet at a point to produce a resultant intensity $5 \,W / m ^2$. The phase difference between two waves is ......
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(c)
$I=I_1+I_2+2 \sqrt{T_1} \sqrt{T_2} \cos \phi$
$5=3+2+2 \sqrt{6} \cos \phi$
$\therefore \cos \phi=0$
$\text { or } \phi=\frac{\pi}{2}$
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