Waves: What can they tell us

1
Waves What can they tell us?

• Slinkys, Light, and Earthquakes

2
What is a wave?

• A disturbance that carries energy through space.
• Examples

3

• Amplitude
• wavelength
• frequency
• period
• wave speed

4
Slinky Demo

• Draw a sketch of the slinky doing a push-pull
  wave.
• Draw a sketch of the slinking doing a shear wave.
• Which of these waves could travel in a liquid,
  but not a solid?
• Which of these waves could travel in a solid and
  a liquid?
• What happens when the push-pull wave hits the
  end?
• What happens when the shear wave hits the end?

5
More Slinkyness...

• What happens when two shear waves hit head on?
• What is traveling across the floor, the slinky or
  the energy?
• A push-pull wave is also known as
• A shear wave is also known as
• What happens to the wave when it hits the
  secondary slinky?

6
Light waves

• Describe the laser beam
• Draw a diagram of the laser going into the fish
  tank, and back out.
• Why does the laser bend?

7
Earthquake waves

• Name the two types of Earthquake waves
• Which one only travels through solid?
• Which one travels through liquid and solid?

8
Journey to the center of the Earth
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P waves and S waves

• S waves cannot be detected beyond 105
• Direct P waves cannot be detected between
  105-140.
• Earthquake Wave activity

10
Sound Wave Extra Credit

• http//www.cpo.com/CPOCatalog/SW/sw_a6.htm
• Go to the above site, complete the activity and
  the worksheet for up to 10 xtra credit points

11
Shadow Zones.