O-LevelPhysicsWaves5054/11 · May/June 2018 · Q341 Mark

A loudspeaker and a microphone are placed in front of a wall. The loudspeaker makes a sound which is detected by the microphone. The microphone is connected to an oscilloscope which is set so that each division on the screen represents 0.01 s. The microphone detects the original sound and the echo. The speed of sound in air is 300 m/s. What is the distance between the loudspeaker and the wall?

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A6.0 m

B12 m

C24 m

D48 m

✓ Correct answer

B: 12 m

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