Singing that is off-pitch by more than about 1% sounds bad. How fast would a singer have to be moving relative to the rest of a band to make this much of a change in pitch due to the Doppler effect

-3.396 m/s or 3.465 m/s

Explanation:

v = Speed of sound in air = 343 m/s

= Relative speed of the singer

f = Observed frequency

f' = Actual frequency

1% change can mean

From the Doppler effect equation we have

The velocity is -3.396 m/s

when

The velocity is 3.465 m/s

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