A source of sound moves towards an observer. (a) The frequency of t...

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A source of sound moves towards an observer.
(a) The frequency of the source is increased.
\( \mathrm{P} \)
(b) The velocity of sound in the medium is increased.
W
(c) The wavelength of sound in the medium towards the observer is decreased.
(d) The amplitude of vibration of the particles is increased.
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