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Waves. What are waves?. There are many different kinds of wave: Light waves Sound waves Waves on water Seismic waves Waves along a rope, or a slinky. There are two sorts of waves. Transverse waves Longitudinal waves. Transverse waves. Most waves are transverse

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Presentation Transcript
what are waves
What are waves?
  • There are many different kinds of wave:
  • Light waves
  • Sound waves
  • Waves on water
  • Seismic waves
  • Waves along a rope, or a slinky
there are two sorts of waves
There are two sorts of waves
  • Transverse waves
  • Longitudinal waves
transverse waves
Transverse waves
  • Most waves are transverse
  • The vibrations in transverse waves go from side to side
  • The energy is travelling in one direction, with the vibrations moving at a 90o angle to the direction the wave is travelling
transverse waves1
Transverse Waves

After a great performance at a drum and bugle corps contest, the audience decides to start a wave in the stands. Each person rises and sits at just the right time so it looks like a wave. This is a transverse wave because, as the wave moves across the stands, folks are moving up and down.

wave direction

longitudinal waves
Longitudinal Waves
  • Longitudinal waves have vibrations moving in the same direction that the wave is travelling in
  • Examples of longitudinal waves are:

Sound waves (in solids, liquids and gases)

Shock waves (e.g. seismic waves )

A slinky (when plucked)

longitinal waves cont

Ouch!

Longitinal Waves (cont.)

C = Compression (high kid density)

R = Rarefaction (low kid density)

The compression (the pulse) moves up the line, but each kid keeps his place in line.

C

Ouch!

R

C

Ouch!

C

R

examples of different waves
Examples of different waves

Transverse waves:

  • All electromagnetic radiation, e.g. light
  • Ripples on water
  • Waves on strings
  • A slinky that is waved up and down

Longitudinal waves:

  • Sound
  • Shock waves
  • A slinky when plucked
what do waves do
What do waves do?

All waves

carry energy

what sort of energy is being carried
What sort of energy is being carried?
  • Heat energy is carried by light, infra red and microwaves
  • X-rays and gamma rays carry energy which can damage cells
  • Sounds carry energy in the form of vibrations. Loud sounds can make an object vibrate (move)
  • Waves on water can move things, and can even be used to generate electrical energy
  • Televisions, radios, fibre optics and speech are all ways in which energy travels (and also information)
what does a wave look like
What does a wave look like?

A wave can be drawn as a wavy line:

what are the main parts of a wave
What are the main parts of a wave?
  • Wavelength ()
  • Amplitude
  • Frequency (f)
  • This is the distance from the crest of one wave to the crest of the next wave
  • This is the height of a wave from the mid-point (where there is no displacement) to a peak
  • This is the number of complete waves per second, passing a certain point. It is measured in Hertz (Hz)