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A bat emitting an ultrasonic wave of frequency $4.5 \times 10^4 \mathrm{~Hz}$ at speed of $6 \mathrm{~m} / \mathrm{s}$ between two parallel walls. The two frequencies heared by the bat will be
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$4.34 \times 10^4 \mathrm{~Hz}, 4.67 \times 10^4 \mathrm{~Hz}$
Frequency received by bat after reflection from wall (1).
$\begin{aligned} t_2 & =f\left[\frac{v-u}{v+u}\right] \\ & =4.5 \times 10^4\left[\frac{330-6}{300+6}\right] \\ & =4.34 \times 10^4 \mathrm{~Hz}\end{aligned}$
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