942+7= 949
949 = f (340+v/340)
f= 942 (340/340-v)
Isolate for frequency
949/942 = (340+v/340-v)
v= 1.26m/s (speed at which a whistler is moving)
You blow a whistle of frequency 942 Hz, as you move towards a wall.
The frequency of beats you hear from the whistle and the reflected sound is 7 beats/s.
In m/s and to two significant figures, how fast are you moving towards the wall?
1 answer