Waves

1
Waves

• Waves are rhythmic disturbances that carry or
  transmit energy through matter and space.
• They may or may not need a medium

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Medium

• medium, the ____________ through which a wave
  transfers.
• What is the medium in this picture

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What other mediums are there

• What is this medium

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Mechanical waves need a __________

• Which of the following is a mechanical wave?
• radio waves
• sonic booms
• earthquakes
• a slinky vibrating
• AC current for your home
• magnetism
• light

5
What causes a drum to work

• How do you talk
• What does vibration have to do with sound
• Three types of waves transverse longitudinal and
  circular

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Longitudinal waves and transverse waves
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Sound is a ____________ wave?

• Water waves are a ____________ wave?
• Transverse wave, the medium moves at right angles
  to the ___________ the wave _______________.

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10-2 sine waves crest and troughs

• The highest __________ of a wave are called the
  ______________
• The lowest the points on a wave are called the
  ___________________

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Amplitude and wavelength
10

• Wavelength is the ____________________ between a
  point on one wave and the identical point on the
  next wave.
• Amplitude is the ________________________ from
  the crest ( or trough) of a wave to the rest
  _________________________ of the medium

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Frequency

• Frequency is the number of complete vibrational
  cycles of a medium per a given amount of time.

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Frequency

• Time is one second
• What is the
• Frequency?
• 6 cycles /s
• 3 cycles/s

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Electromagnetic waves

• Does light require a medium

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Electromagnetic spectrum
15
Copy the table 10-1 on 334
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Velocity of a wave

• Wave Velocity
• Velocity wavelength times the frequency

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Speed depends on the medium

• Travel slower through gasses
• Faster through solids
• Why does the Indian listen to the railroad tracks

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(No Transcript)
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Light refracts due to the change of speed in a
new mediumSpeed of light in a vacuum
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Doppler effect

• Pitch frequency
• The ___________ the pitch, the higher the
  frequency.
• An observed change in the frequency of a wave
  when the source is moving relative to the
  receiver.
• If the source is coming towards you the pitch
  will __________?

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10-3 combining waves

• ___________ the bouncing back of a wave as it
  meets a surface or boundary

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Page 341

• ____________ is the bending of a wave as it
  passes an edge or an opening

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10-3 combining waves

• ___________________ is the ability of two or more
  waves to combine and form a new wave.
  Constructive interference occurs when the
  _____________ of different waves arrive at the
  same ________ at the same ____________
• Destructive interference is ______________________
  _
• The effect produced by many reflections of sound
  is called ______________

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Reflection

• Waves can and do meet boundaries in their medium.
  When a wave meets a boundary, it can be reflected
  or transmitted. Reflection can be partial or
  complete. Reflection can also involve a phase
  flip (change of phase of 180 degrees.)

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Reflected and obsorbed
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Transmitted waves are refracted or diffracted

• Refraction occurs when a wave crosses a boundary
  from one medium to another. A wave entering a
  medium at an angle will change direction.
• Diffraction refers to the "bending of waves
  around an edge" of an object. Diffraction depends
  on the size of the object relative to the
  wavelength of the wave.
• All these phenomena apply to electromagnetic
  waves, such as light waves, as well as to
  pressure waves and water waves.

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Diffracted
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Refracted wave

• Incident
• wave
• Refracted
• wave

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Interference in music and light

• Why do bubbles or oil on water have a rainbow of
  color?
• Why do you hear beats?

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Harmonic motion and waves

• Waves will have nodes and antinodes
• We can add the amplitude of two waves together.
• http//id.mind.net/zona/mstm/physics/waves/standi
  ngWaves/understandingSWDia1/UnderstandingSWDia1.ht
  ml
• More than one wave http//www.colorado.edu/physics
  /2000/schroedinger/