Physics for IGCSE & O level - Waves And Sounds (Section 3 - No. 35)
Which of the following is a practical application that uses ultrasound?
Measuring the depth of a lake.
Cooking food in a microwave.
Sending radio signals.
Observing distant galaxies.
คำอธิบาย
Echolocation (mentioned in relation to ultrasound) helps measure depth.