Sound - Doppler Shift

Question 1

Doppler shift

Answer 1

• a change in frequency due to the Doppler effect.

Question 2

Doppler effect

Answer 2

• an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the redshift seen by astronomers.