The wavelength of ultrasonic waves in air is of the order of
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$\lambda = \frac{v}{n}\,;\,n \approx 50,000\,Hz$,
$v = 330 \,m/sec \Rightarrow \lambda = \frac{{330}}{{50000}}m$
$ = 6.6 \times {10^{ - 5}}cm \approx 5 \times {10^{ - 5}}cm$
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