If a source of solid is moving, a stationary listener will hear a sound of different frequency. This is called?
A
doppler effect
B
resonance
C
ultra sound
D
rarefaction
Verified Correct Answer: A.
Physical Principles & Numerical Solution
The Doppler effect or Doppler shift is the change in frequency of a wave in relation to an observer who is moving relative to the wave source.
The drop in pitch of ambulance sirens as they pass by and the shift in red light are common examples of the Doppler Effect.
Source: WAEC / JAMB / NECO Classroom Archive (Record #56901)