Physics
How is it possible to detect the filling of a bottle under a water tap by hearing the sound at a distance?
Sound
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Answer
It is possible to detect the filling of a bottle under a water tap by hearing the sound at a distance due to the pitch of the sound.
As the water level in a bottle kept under a water tap rises, the length of air column decreases, so the frequency of sound produced increases.
As frequency increases the pitch becomes shriller.
Hence, by hearing the sound from a distance, one can get an idea of water level in the pitch.
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