The Doppler effect
3 marks · EasyA cyclist is ringing a bell as she moves along a road.
What effect does her motion have on the sound heard by someone in front of her?
What effect does her motion have on the sound heard by someone behind her?
Name the effect described in a) and b).
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(a) Sound has a higher pitch (frequency) to someone in front.
(b) Sound has a lower pitch (frequency) to someone behind.
(c) Doppler effect
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · States higher frequency or pitch heard in front.
B1 (b) · 1 mark · States lower frequency or pitch heard behind.
B1 (c) · 1 mark · Names Doppler effect.
Worked solution
a) Someone in front hears a higher-pitched sound. b) Someone behind hears a lower-pitched sound. c) The Doppler effect.