What is echo?
A repeated sound caused by the reflection of a soundwave
Sound has to bounce back a ............. surface to create an echo.
Hard surface
Why can we hear an echo in a large cave and not in your bedroom?
There has to lots of space and surrounded by a hard surface
What do sea creatures use to travel in the deep ocean?
Echolocation
Which sea creatures use echolocation?
Dolphins and whales
Why do bats use echolocation?
To fly at night, and to find objects and food
Can you hear an echo if the sound hits the curtains in your house?
No (it is a soft surface)
What is decibel?
Measurement to calculate volume
Why is this person wearing headphones?
Noise cancellation headphones to protect their ears from the loud sounds on the runway
Name the three parts of a ear.
Inner, Middle and Outer ear
Which part of our ear vibrates when sound waves reach it?
Eardrums
How does earwax help us?
Fights infection and traps dirt to keep the ear clean
From the ear, the sound travels to which part of the body?
The Brain
In this picture, which sound waves show high pitch?
Blue sound waves
