The Doppler Effect Video Lessons

Concept

# Problem: An object emitting a sound at a constant frequency is thrown into the air. As the source travels up and back down again, the frequency you hear is going to change via the Doppler effect. Assuming the source is always above your ear, which of the following statements if true: (a) The frequency heard will start at a maximum and decrease through the entire trip (b) The frequency heard will start at some value, decrease to a minimum value as it rises, and then increase back to its starting value as it falls (c) The frequency heard will start at some value, increase to some maximum value as it rises, and then decrease back to its starting value as it falls (d) The frequency heard will start at a minimum and increase through the entire trip

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###### Problem Details

An object emitting a sound at a constant frequency is thrown into the air. As the source travels up and back down again, the frequency you hear is going to change via the Doppler effect. Assuming the source is always above your ear, which of the following statements if true:

(a) The frequency heard will start at a maximum and decrease through the entire trip

(b) The frequency heard will start at some value, decrease to a minimum value as it rises, and then increase back to its starting value as it falls

(c) The frequency heard will start at some value, increase to some maximum value as it rises, and then decrease back to its starting value as it falls

(d) The frequency heard will start at a minimum and increase through the entire trip