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 )

Step-by-step solution

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