CAIE IGCSE Physics Echoes and Reflected Sound

Practise identifying an echo as reflected sound and use the round-trip travel distance with measured time and sound speed to locate a reflecting surface.

Exam points

identify reflection as the wave behaviour that produces a delayed sound echo
use total sound path = speed × echo time and divide by two for one-way distance
rearrange the round-trip relationship to calculate sound speed from distance and delay

[Maximum number: 1]

State the name of the reflection of a sound wave or ultrasound wave.

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3.4.8—An echo as the reflection of sound question 1