PH-784
Echoes and ultrasound
Physics · Secondary 3 · Easy · Echoes and ultrasound
A man stands 120 m from a vertical cliff and fires a starting pistol. He hears the echo of the sound 0.70 s after he sees the flash. What is the speed of sound in air?
- 340 m s⁻¹
- 343 m s⁻¹
- 171 m s⁻¹
- 480 m s⁻¹
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