The Doppler Effect

1 mark · Easy

Which effect will a stationary observer notice when a sound source moves away from them at high speed?

Show answer

Correct option: The sound decreases in frequency (lower pitch).

Common mistakes: Choosing 'increases in frequency'

Show mark scheme and worked solution

Marking points

A1 · 1 mark · Correctly selects that the frequency decreases (lower pitch) when the source moves away.

Worked solution

The sound decreases in frequency (lower pitch).