Question

Steve hears a siren emitting a frequency of 10 kHz when it is at rest. What frequency will Steve hear if the siren moves toward him at 30 m/s? Assume the speed of sound is 340 m/s. Answer options are:

a.11 kHz
b.10 kHz
c. 0 kHz
d. 9 kHz

Answer 1

The frequency what Steve will hear is option a) f'≅ 11kHz

Step-by-step explanation:

f= 10 kHz

v= 340 m/s

vf= 30 m/s

vo= 0

f'= f * (v/ v- vf)

f'=10.96 kHz ≅ 11 kHz