# Lesson 2 — 5.1 Sound, vibrations, and energy transfer

Period 2
Sound
1 / 21
Slide 1: Tekstslide
SoundBasisschoolGroep 2

In deze les zitten 21 slides, met tekstslides en 3 videos.

## Onderdelen in deze les

Period 2
Sound

#### Slide 1 -Tekstslide

This lesson
What is a sound wave?
Medium – The speed of sound in different mediums
Compression & refraction
Longitudinal and transverse waves

#### Slide 2 -Tekstslide

Learning goals
• Describe how sound waves are produced and how they travel.

• Explain what is meant by compression and rarefaction.

• Explain what is meant by a medium.

• Name the speed of sound in several materials.

•  Explain what is meant by longitudinal and transverse waves.

What is sound?

#### Slide 5 -Tekstslide

Sound is a vibration
• A vibration Causes a wave
• A sound wave

#### Slide 6 -Tekstslide

A sound wave simulation

#### Slide 10 -Tekstslide

Where do you the compression and rarefaction?

#### Slide 11 -Tekstslide

Where do you the compression and rarefaction?
Compression

#### Slide 12 -Tekstslide

Where do you the compression and rarefaction?
Compression
Rarefaction

#### Slide 13 -Tekstslide

Sound waves require a medium
• Air
• Water
• Metal

#### Slide 14 -Tekstslide

Sound waves require a medium
• Air (gas)
• Water (liquid)
• Metal (solid)

#### Slide 15 -Tekstslide

Sound waves require a medium
• Air (gas) — 343 m/s
• Water (liquid) — 1500 m/s
• Metal (solid) — 5100 m/s

#### Slide 17 -Tekstslide

How sound works
• A sound source creates a vibration
• This vibration creates sound waves that travels through a medium to our ears.
• Our ear sends a signal to our brain.
• Our brain turns that signal into the sound we hear.

#### Slide 18 -Tekstslide

Longitudinal vs transverse waves

#### Slide 19 -Tekstslide

Exercise
A) A person standing 3 meter behind a 0,4 meter thick concrete wall claps two piece of wood together. You are standing four meters in front of the wall. The speed of sound in concrete is 3700 m/s. The speed of sound in air is 343 m/s. Calculate how long it takes before you hear the sound of the clap.

B) A water proof speaker is placed 30 meters underwater in a lake. On top of the liquid water lies a frozen sheet of 2 meter thick ice. A geese flies 100 meter above the lake. The speed of sound in water is 1500 m/s, the speed of sound in ice is 1830 m/s, the speed of sound in air is 343 m/s. Calculate how long it would take for a sound wave to travel to the hight of the geese.

#### Slide 20 -Tekstslide

Learning goals
• Describe how sound waves are produced and how they travel.

• Explain what is meant by compression and rarefaction.

• Explain what is meant by a medium.

• Name the speed of sound in several materials.

•  Explain what is meant by longitudinal and transverse waves.