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(a) How does sound produced by a source ...

(a) How does sound produced by a source reach the listener ?
(b) What is the wavelength of a `5 xx 10^4 Hz` sound wave pulse emitted by a bat ?

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(a) Sound reaches the listener through the vibrating particles of the medium without any transport of the medium.
(b) `lamda = (v)/(v) = (344 m//s)/(5 xx 10^4 Hz) = 68.8 xx 10^-4 m = 6.88 mm`.
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