Which describes a scenario in which the doppler affect is occurring the volume increases the pitch changes from low to high the pitch changes from high to low the volume decreases

The pitch changes from high to low

Explanation:

Doppler effect occurs when there is change of pitch caused by either a moving sound source and a stationary observer.

Doppler effect is the change in wavelength or frequency of a sound source relative to the movement of an observer.

shows up as a (purple)/ (flashing) red or blue dot getting bigger and brighter.

explanation:

mistakes are ok