You are standing directly between two speakers that are separated by 30 m.The two speakers are each playing a pure tone of 256 Hz.You begin running directly towards one of the speakers and you measure a beat frequency of 6.0 Hz.How fast are you running?
A)1.4 m/s
B)4.0 m/s
C)5.0 m/s
D)8.5 m/s
E)43 m/s

Question

Quizplus · Accepted Answer

The beat frequency is the difference in frequency due to the Doppler effect. Using the formula for the Doppler effect and the speed of sound (approximately 343 m/s), the speed can be calculated to be 4.0 m/s.

You Are Standing Directly Between Two Speakers That Are Separated