A source of sound is travelling towards a stationary observer. The ...

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Observer (2017)
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A source of sound is travelling towards a stationary observer. The frequency of sound heard by the observer is of three times the original frequency. The velocity of sound is \( v \mathrm{~m} / \mathrm{sec} \). The speed of source will be
\( \mathrm{P} \)
[MP PET 1991; Similar AIEEE 2006]
(a) \( \frac{2}{3} v \)
(b) \( v \)
(c) \( \frac{3}{2} v \)
(d) \( 3 v \)
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