A table is revolving on its axis at 5 revolutions per second. A sound source of frequency 1000 Hz is fixed on the table at 70 cm from the axis. The minimum frequency heard by a listener standing at a distance from the table will be (speed of sound = 352 m s - 1 )

Question

A table is revolving on its axis at 5 revolutions per second. A sound source of frequency 1000 Hz is fixed on the table at 70 cm from the axis. The minimum frequency heard by a listener standing at a distance from the table will be (speed of sound = 352 m s - 1 ), 1000 Hz, 1066 Hz, 941 Hz, 352 Hz

MARKS App · Accepted Answer

v s = r ω = r × 2 π v = 70 100 × 2 × 22 7 × 5 = 22 m s - 1 Frequency is minimum when the source is moving away from the listener. ν ′ = u × ν u + v s = 352 × 1000 352 + 22 = 941 H z

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