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Sing in lower than 30 decibels to a friend
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Talk in high pitch with a teacher
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Talk in low pitch to a friend
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In this picture, which sound waves show high pitch?
Blue sound waves
From the ear, the sound travels to which part of the body?
The Brain
How does earwax help us?
Fights infection and traps dirt to keep the ear clean
Which part of our ear vibrates when sound waves reach it?
Eardrums
Name the three parts of a ear.
Inner, Middle and Outer ear
Why is this person wearing headphones?
Noise cancellation headphones to protect their ears from the loud sounds on the runway
What is decibel?
Measurement to calculate volume
Can you hear an echo if the sound hits the curtains in your house?
No (it is a soft surface)
How are human actions affecting dolphins and whales to travel in the oceans and seas?
Too much a disturbance and sound in the oceans and seas causes sea creatures to get confuse and difficult to track echolocation
Why do bats use echolocation?
To fly at night, and to find objects and food
Which sea creatures use echolocation?
Dolphins and whales
What do sea creatures use to travel in the deep ocean?
Echolocation
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
Sound has to bounce back a ............. surface to create an echo.
Hard surface
What is echo?
A repeated sound caused by the reflection of a soundwave
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