Echoes and Ultrasound Flashcards

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What is an echo?

An echo is the reflection of sound that reaches the listener after a delay, following the direct sound.

How do soft furnishings affect echoes?

Soft furnishings like carpets, cushions and curtains absorb more sound waves, reducing the effect of echoes.

How can we measure the speed of sound using an echo?

Measure the distance to the reflecting surface, double it, and then divide by the time taken for the echo to return (Speed = Distance ÷ Time).

How do bats use ultrasound and echoes?

Bats emit ultrasound calls and listen for the echoes to navigate and locate prey, a process called echolocation.

What is the range of human hearing in hertz (Hz)?

The range of human hearing is between 20 Hz and 20,000 Hz.

How is ultrasound used in pregnancy?

Doctors use ultrasound waves, which reflect off organs, to create an image of the unborn baby, using echoes detected by a microphone.

Revision Notes
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