Question #009a8
1 Answer
The Doppler effect for sound is used to find an observed frequency of 835 Hz.
Explanation:
The Doppler effect for sound tells us that in this case, where the listener is moving toward a stationary sound source, the observed frequency
where
This is a 4.4% increase in frequency, which is readily noticeable by the listener, based on the fact that a semitone in music (C to C#, for instance) is a 5.9% increase.
Note that the equation used for calculating the observed frequency for a moving listener is not the same as the one used if the listener is stationary and the source is moving. In that case, you would use
with the + sign used for the case where the distance between source and listener is decreasing, and the - sign used when the distance is increasing.