Draw me a wave!
YouTube - Water bubble in Space (zero gravity)
Learning Outcomes
Everyone should:
•Define a wave
•Differentiate between longitudinal and transverse waves (with
examples)...
Waves
Waves can transfer energy and
information without a net motion of the
medium through which they travel.
They involve...
Rays
Rays indicates the direction of energy
transfer.
Transverse waves
The oscillations are perpendicular to
the direction of energy transfer.
Direction of energy transfer
osci...
Transverse waves
Peak/crest
trough
Transverse waves
• Water ripples
• Light
• On a rope/slinky
• Earthquake
Longitudinal waves
The oscillations are parallel to the direction
of energy transfer.
Direction of energy transfer
oscilla...
Longitudinal waves
compression
rarefraction
Longitudinal waves
• Sound
• Slinky
• Earthquake
Wave measurements
Amplitude - A
The maximum height of the wave from
the middle line position.
amplitude
Frequency - f
The number of complete waves
(oscillations) in one second. Measured in
Hertz.
50 Hz = 50 vibrations/waves/os...
1 2
0
2
1
1
2
Height
(m)
Time (s)
Frequency – The number of
waves per second. If one wave
passes in one second it has a
fr...
Wavelength - λ
The length of one complete wave.
wavelength
Wave speed - v
The speed at which the wave fronts
pass a stationary observer.
330 m.s-1
The Wave Equation
V = speed of wave (m/s)
f = frequency of wave (Hz)
λ = wavelength (m)
v = fλv
λf x
1) A water wave has a frequency of 2Hz and a wavelength of
0.3m. How fast is it moving?
2) A water wave travels through a ...
Wave equation questions
v
λf x
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Intro to waves

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Introduction Waves

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Intro to waves

  1. 1. Draw me a wave! YouTube - Water bubble in Space (zero gravity)
  2. 2. Learning Outcomes Everyone should: •Define a wave •Differentiate between longitudinal and transverse waves (with examples) Most will: •Define amplitude, wavelength, frequency and period of a wave •Describe the relationship between frequency and period Some might: •Use the wave equation
  3. 3. Waves Waves can transfer energy and information without a net motion of the medium through which they travel. They involve vibrations (oscillations) of some sort.
  4. 4. Rays Rays indicates the direction of energy transfer.
  5. 5. Transverse waves The oscillations are perpendicular to the direction of energy transfer. Direction of energy transfer oscillation
  6. 6. Transverse waves Peak/crest trough
  7. 7. Transverse waves • Water ripples • Light • On a rope/slinky • Earthquake
  8. 8. Longitudinal waves The oscillations are parallel to the direction of energy transfer. Direction of energy transfer oscillation
  9. 9. Longitudinal waves compression rarefraction
  10. 10. Longitudinal waves • Sound • Slinky • Earthquake
  11. 11. Wave measurements
  12. 12. Amplitude - A The maximum height of the wave from the middle line position. amplitude
  13. 13. Frequency - f The number of complete waves (oscillations) in one second. Measured in Hertz. 50 Hz = 50 vibrations/waves/oscillations in one second.
  14. 14. 1 2 0 2 1 1 2 Height (m) Time (s) Frequency – The number of waves per second. If one wave passes in one second it has a frequency of one Hertz or Hz. This is the unit of frequency.
  15. 15. Wavelength - λ The length of one complete wave. wavelength
  16. 16. Wave speed - v The speed at which the wave fronts pass a stationary observer. 330 m.s-1
  17. 17. The Wave Equation V = speed of wave (m/s) f = frequency of wave (Hz) λ = wavelength (m) v = fλv λf x
  18. 18. 1) A water wave has a frequency of 2Hz and a wavelength of 0.3m. How fast is it moving? 2) A water wave travels through a pond with a speed of 1m/s and a frequency of 5Hz. What is the wavelength of the waves? 3) The speed of sound is 330m/s (in air). When Dave hears this sound his ear vibrates 660 times a second. What was the wavelength of the sound? 4) Purple light has a wavelength of around 6x10-7 m and a frequency of 5x1014 Hz. What is the speed of purple light? Group wave equation questions 0.2m 0.5m 0.6m/s 3x108 m/s
  19. 19. Wave equation questions v λf x

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