P1.2.5 - Echoes and Ultrasound Flashcards
1
Q
What is an echo?
A
Where a sound reflects off a surface and is detected by the ears.
2
Q
Why is there a delay between making a sound and hearing an echo?
A
It takes sound time to travel.
3
Q
What is the equation for calculating distance using echoes?
A
Distance = (Speed of Sound x Delay Time) ÷ 2
4
Q
What do we call it when lots of echoes combine?
A
Reverberation
5
Q
How can you reduce the effect of echoes?
A
By putting soft materials on the walls.
By putting down carpets on the floor.
6
Q
What is ultrasound?
A
Sound with a frequency greater than 20 000 Hz
7
Q
List some functions of ultrasound.
A
- Bats/dolphins use ultrasound for echolocation.
- Ships use ultrasound to detect the depth of the ocean floor.
- Doctors use it to create images of unborn babies.
