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A source of sound A emitting waves of frequency 1800 Hz is falling towards ground with a terminal speed v .The observer B on the ground directly beneath the source receives waves of frequency 2150 Hz .The source A receives waves , reflected from ground , of frequency nearly : (Speed of sound =343 m/s)

$(a)\;2150\;Hz \qquad(b)\;2500\;Hz \qquad(c)\;1800\;Hz \qquad(d)\;2400\;Hz $

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