PH-2255
Echoes and ultrasound
Physics · Secondary 4 · Medium · Echoes and ultrasound
A boy shouts towards a cliff and hears the echo 0.80 s later. The speed of sound in air is 320 m/s.
How far is the boy from the cliff?
How far is the boy from the cliff?
- 64 m
- 96 m
- 128 m
- 256 m
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