ANSWER ASAP FOR 40 POINTS


The Doppler effect is the result of a ____ sound source that causes the sound to appear higher or lower than its true ____. As a sound source approaches an observer, the distance between each ____ in the wave is ____. This causes a ____ perceived pitch. As a source moves away from an observer, the distance between each crest in the wave is ____. This causes a ____ perceived pitch. The size of the pitch ____ is determined by the speed of the source relative to the speed of ____.

Word Bank

higher
shift
increased
moving
lower
pitch
sound
crest
shortened