waves chapter 23 physical science review of waves
TRANSCRIPT
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WAVES
Chapter 23
Physical Science
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REVIEW OF WAVES
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Waves transfer what?
ENERGY!!!!
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What are the two main types of waves?
• MECHANICAL WAVES
• ELECTROMAGNETIC WAVES
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Which type of wave requires a medium?
MECHANICAL WAVESElectromagnetic waves do NOT
need a medium.
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What are 3 examples of Mechanical Waves?
• Water waves
• Sound waves
• Seismic waves
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What are some examples ofElectromagnetic Waves?
• Radio waves
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• Microwaves
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• Infrared light
• Visible light
• Ultraviolet light
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• X-rays
• Gamma Rays
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What are the colors of Visible Light?
• R O Y G B I V
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R O Y G B I V
• RED
• ORANGE
• YELLOW
• GREEN
• BLUE
• INDIGO
• VIOLET
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Which color is the HIGHEST energy wave?
• VIOLET
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Which color is theLOWEST energy wave?
• RED
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What 3 characteristics doAll Waves have?
• Amplitude
• Wavelength
• Frequency
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What does the size of the amplitude of a wave tell us?
• HIGH AMPLITUDE = HIGH AMOUNTS OF ENERGY• LOW AMPLITUDE = LOW AMOUNTS OF ENERGY
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What unit do we use to measure Wavelengths in?
• Meters
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What greek letter do we useto represent a wavelength?
• Lambda
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What are the 3 units we can use for Frequency of a wave?
• Waves / second
• Cycles / second
• 1/s = Hertz (Hz)
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Name the 2 types of Mechanical waves.
• TRANSVERSE WAVES
• LONGITUDINAL WAVES
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Which type of wave form crests and troughs?
• TRANSVERSE
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Longitudinal wave do not have crests and troughs,
instead they have what?
• COMPRESSIONS
• RAREFACTIONS
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How does the medium movewhen a longitudinal wave moves
through it?
• The medium vibrates horizontally.
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Surface Waves move both horizontally and vertically
simultaneously, which produces what kind of movement?
• Circular
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Speed of WavesWhat is the wave equation?
• V = f • speed = frequency times wavelength
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The speed of a wave is held constant within a medium. So
what effect on the wavelength of a wave would you expect if the
frequency were doubled?• The wavelength would half as much.
When frequency goes up the wavelength must go down.
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The density of water is 1 g/ml and the density of syrup is 3 g/ml. Which of the above would you
expect a wave to travel the slowest through?
• A wave would travel the slowest through the SYRUP.
• Waves travel slower through dense mediums.
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A slinky is a very elastic object. Explain why this is used to
demonstrate wave motion instead of an object like a tree branch?
• A slinky has HIGH ELASTICITY !
• The higher the elasticity the higher the speed of a wave traveling through it.
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Name the 4 ways waves interact.
• Reflection
• Refraction
• Diffraction
• Interference
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Explain reflection of a wave.
• Bouncing back of a wave after it strikes a boundary.
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Explain Refraction.• The change in path of a
wave when it moves into a medium of a different density.
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Explain Diffraction.• The curving of waves around barriers and
ability of waves to spread out in circular pattern after passing through a narrow opening. See picture below.
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What are the 2 types of Interference?
• Constructive
• Destructive
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Which of the pictures below is an example of
Constructive Interference?
The picture on the left is constructive interference.The picture on the right is destructive interference.
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Nodes and Antinodes are parts of what kind of wave?
• Standing Wave
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The frequency at which a standing wave occurs is called
what?
• Resonant Frequency
• Sometimes called Natural Frequency.
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