A person carrying a whistle emitting continuously a note of 272 Hz is – McqOptions

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1.	A person carrying a whistle emitting continuously a note of 272 Hz is running towards a reflecting surface with a speed of 18 km/hour. The speed of sound in air is \[345m{{s}^{-1}}\]. The number of beats heard by him is [Kerala (Engg.) 2002]
A.	4
B.	6
C.	8
D.	3
Answer» D. 3

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