CBSE-XI-Physics
16: Sound Wave
- #2When we clap our hands, the sound produced is best described by
(a)
p=p0 sinkx-ωt
(b)
p=p0 sin kx cos ωt
(c)
p=p0 cos kx sin ωt
(d)
p=∑p0n sin knx-ωnt.
Here p denotes the change in pressure from the equilibrium value.digAnsr: dAns : (d) `` p=\sum {p}_{0n}\,\mathrm{\,sin\,}\left({k}_{n}x-{\omega }_{n}t\right)``.
When we clap, there is a change in pressure, which sets a disturbance and forms a wave. However, this variation is not uniform every time we clap (unlike in the case of a sound wave). Hence, we sum up all the disturbances.
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