Lesson 2 — 5.1 Sound, vibrations, and energy transfer

Period 2
Sound
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Slide 1: Slide
SoundBasisschoolGroep 2

This lesson contains 21 slides, with text slides and 3 videos.

Items in this lesson

Period 2
Sound

Slide 1 - Slide

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

Slide 2 - Slide

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.

Slide 3 - Slide

Slide 4 - Video

What is sound?

Slide 5 - Slide

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

Slide 6 - Slide

A sound wave simulation

Slide 7 - Slide

Slide 8 - Video

Slide 9 - Video

Slide 10 - Slide

Where do you the compression and rarefaction?

Slide 11 - Slide

Where do you the compression and rarefaction?
Compression

Slide 12 - Slide

Where do you the compression and rarefaction?
Compression
Rarefaction

Slide 13 - Slide

Sound waves require a medium
  • Air
  • Water
  • Metal

Slide 14 - Slide

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

Slide 15 - Slide

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

Slide 16 - Slide

Slide 17 - Slide

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 - Slide

Longitudinal vs transverse waves

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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 - Slide

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.

Slide 21 - Slide