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

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

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

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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