# 5.1 Sound vibration and energy transfer

Objectives
• Describe how sound waves are produced.
• Describe how sound waves travel.
• Expalin what is meant by a medium and why sound waves need it.
• Name the speed of sound in several materials and expalin why the speed of sound is different in solids, liquids and gasses.
• Describe the difference between longitudial and transverse waves and be able to recognise them.

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Slide 1: Tekstslide
Natuurkunde / ScheikundeMiddelbare schoolvwoLeerjaar 1

In deze les zitten 11 slides, met tekstslides.

## Onderdelen in deze les

Objectives
• Describe how sound waves are produced.
• Describe how sound waves travel.
• Expalin what is meant by a medium and why sound waves need it.
• Name the speed of sound in several materials and expalin why the speed of sound is different in solids, liquids and gasses.
• Describe the difference between longitudial and transverse waves and be able to recognise them.

#### Slide 1 -Tekstslide

In a loudspeaker, the part that
vibrates is the cone

in a guitar, the part that
vibrates are the strings
Sound is produced
by vibrations
in a soundsource. Your vocal cords vibrate to produce sound

#### Slide 2 -Tekstslide

Sound cannot travel in vacuum.
Sound needs material or medium to travel through, such as air, water or solid object beton, wall etc...

#### Slide 3 -Tekstslide

3) The speed of sound in steel is 5100 m/s, in water is 1500 m/s, but in air only 330 m/s,
Copy and complete the sentences below, using these words or phrases to fill in the gaps. Some owrds or phrases are not needed.
Closer together,    Further appart,    Less,    More

• The speed of sound in water is faster than the speed of sound in air because in water the particles are ...........lthan they are in air.
• The speed of sound in air is slower than the speed of sound in steel ,in steel the particles are ............than they are in air.
• A sound made underwater will take ......... time to travel a certain distance than a sound made in air.

#### Slide 4 -Tekstslide

In a soundwave the air (or another medium) actually doesn't go up and down.

What do the ups and down in the visual depiction of a wave indicate about the air?
In a sound wave the air gets comprsessed together and then decompresed. The peaks indicates areas of compression. The valleys indicate areas of decompression.
As seen in the image on the right.

#### Slide 6 -Tekstslide

Sound waves
a.Sound is a longitudinal wave, the particles are vibrating parallel to the motion of the wave which is travelling
b. Transverse wave. The paricles vibrate at 90 dgrees to the direction that wave is moving

Transverse wave

#### Slide 8 -Tekstslide

Longitudinal waves

#### Slide 9 -Tekstslide

1)How is sound produced?
2) What is a medium?

3) Explain what is meant by
• a) Compression
• b) rarefaction (decompression)

4) Longitudinal waves, transverse waves
• a) How are they different?
• b) What do they have in common? Both transport energy without transporting matter.

#### Slide 10 -Tekstslide

Tekst
is How is sound produced? Vibration in a sound source
What is a medium?
Sound waves need a medium ( solid,liquid or gas to travel)
What is meant by compression and rarefaction? Compression: the particles are close to each other
Rarefaction: particles are  further apart
Longitudinal and transverse waves.
How are they different? In l.waves the particles vibrate in the same direction as the waves.  In  T. Parallelwaves the particles move up and down and are perpendicular to the the movement of the waves.
What do they have in common?
Both transport energy without transporting matter.