Question

(i) Name four ways in which sound can be produced.
​(ii) Calculate the speed of a sound wave whose frequency is 2 kHz and wavelength 65 cm.

Answer 1

(i) Four different ways to produce the sound:

(1) Sound can be produced by hitting a hard surface. i.e. Metals, walls, etc.

(2) Sound can be produced by generating vibrations, like in a guitar.

(3) Plucking the rubberband by the hand can produce sound.

(4) Sound can be produced by scratching hard or rough surfaces.


(ii) According to relation, Speed of the sound wave, $v=f\lambda$ (Where 'f' is the frequency of the wave and $\text{'}\lambda \text{'}$ is the wavelength)

$\therefore v=\left(2\times {10}^3\mathrm{Hz}\right)\times \left(65\times {10}^{-2}\mathrm{m}\right)=1300\mathrm{m}/\mathrm{s}$

Hence, the speed of the given sound wave is 1300 m/s.