An Eider duck is flying Northeast at 25 m/s at an angle of 36.9 degrees to the ground (from the positive
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The relationship between the speed, the frequency and the wavelength of a wave is given by:
where
f is the frequency
v is the speed of the wave
is its wavelength
for the pressure wave in this problem,
and v=1400 m/s, therefore its frequency is
where
f is the frequency
v is the speed of the wave
for the pressure wave in this problem,