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?
Person B will hear the frequency that is lower than the B- flat.
Person B hears a note that is lower than a B-flat. This is because as the runner is going away from the stationary trumpeter, the sound waves become elongated, or stretched out. This increases the wavelength and decreases the frequency.
the answer is c
Person C hears a note that is higher than a B-flat. This is because as the runner approaches the stationary trumpeter, the sound waves become compressed. This reduces the wavelength and increases the frequency.
(usa testprep explanation)
hears a higher frequency.
The person running away from the trumpet, Mrs. B,
hears a lower frequency.
The trumpeter, Mr. A, and the person who is just standing still
and listening, Miss D, both hears the beautiful perfect B-flat.
Person C, the one running towards the trumpeter, hears a pitch
that is higher than B-flat. (A)
Person B, the one running away from the trumpeter, hears a pitch
that is lower than B-flat.
Person D, the one standing still the whole time, hears the B-flat.