(a) Name four ways in which sound can be produced.
(b) Calculate the speed of a sound wave whose frequency is 2 kHz and wavelength 65 cm.
(a) Sound can be produced by the following methods:
(i). By vibrating strings (as in a sitar),
(ii). By vibrating air (as in a flute),
(iii). By vibrating membranes (as in a drum)
(iv). By vibrating plates (as in cymbals)
(b). Here given, frequency $f=2\ kHz=2\times10^3\ Hz$
Wavelength $\lambda=65\ cm=65\times10^{-2}\ m$
So, Speed of sound wave$=frequency(f)\times wavelength(\lambda)$
$=2\times10^3\ Hz\times65\times10^{-2}\ m$
$=1300\ m/s$
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