Physics, 25.08.2019 02:20 gachaperson123

Trumpeter a holds a b-flat note on the trumpet for a long time. person c is running towards the trumpeter at a constant velocity. person b is running away from the trumpeter at the same rate. person d is standing still the whole time.
which person hears a frequency that is lower than the b-flat?
a) person a
b) person b
c) person c
d) person d

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Trumpeter a holds a b-flat note on the trumpet for a long time. person c is running towards the trum...