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# Sound

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by

## Paul Sheffield

on 25 January 2016

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#### Transcript of Sound

Sound
L.O
What is sound?
How do we hear?
Limits of human hearing
dangers to human hearing

How does sound travel?
Scientific writing
using the following words describe and explain why sound is faster in water than air
How do we hear?
Starter
what causes sound?
what type of wave is it?
what does sound need to travel through?
If sound travels at 340 m/s in air and has a frequency of 10,000Hz. What is its wavelength?
Remember Velocity= frequency X wavelength
Dangers to hearing
Vibrations
density
particles
energy
Sound
L.O
Dangers
Ultrasound
Sonar
seismic waves

Ultrasound
Key facts
frequency above 20,000Hz (above human hearing
the sound waves get reflected at the boundary of different tissues
time taken for the reflection to be detected is used to build a picture
can see soft tissue aswell as bone
Calculations
distance = speed X time
A pulse of ultrasound is sent out from an electronic system on-board the ship.

It takes 0.80 seconds for the emitted ultrasound to be received back at the ship.

Calculate the depth of the water.

Speed of ultrasound in water = 1600 m / s

Use the correct equation from the Physics Equations Sheet.

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Depth of water = .................................................. metres

(3)

(c) Ultrasound can be used in medicine for scanning.

State one medical use of ultrasound scanning.

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(1)

Siesmic waves
Key facts
provide evidence for the earths structure
p waves= longitudinal
travel at different speeds in different materials
s waves= transverse
can't travel through a liquid
Sonar
Full transcript