Question

a tuning fork of frequency 500 Hz is rotating on the edge of a disk of radius 1.2 meters. (a) If the disk turns at a rate of 40 rev/min, what are the maximum and minimum frequencies heard by the listener? (b) To what positions of the tuning fork do these frequencies correspond?

Answer 1

max velocity toward the listener occur on the opposite sides.

veloicty of disk (source):radius*angular velociyin Radians/sec

then use the doppler equation