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![Page 1: I can: compare and contrast different types of wave Do Now: What do you know about waves? Draw a concept web.](https://reader035.fdocuments.net/reader035/viewer/2022081519/56649d885503460f94a6d9f1/html5/thumbnails/1.jpg)
I can: compare and contrast different types of wave
Do Now: What do you know about waves? Draw a concept web
![Page 2: I can: compare and contrast different types of wave Do Now: What do you know about waves? Draw a concept web.](https://reader035.fdocuments.net/reader035/viewer/2022081519/56649d885503460f94a6d9f1/html5/thumbnails/2.jpg)
• A wave is a rhythmic disturbance which carries energy through space or matter.
A medium is a material through which a wave transfers energy.
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Types of Waves
• Based on the way they move, there are 3 different types of waves:
1. Transverse Waves
2. Compressional Waves
3. Electromagnetic waves
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Transverse Waves• In a transverse wave, the wave's medium
move perpendicular to the direction of the wave. Ex. ocean waves, light waves
• For example, as the wave moves left to right, the medium moves up and down.
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• Say you're waterskiing down at the lake and you wipe out. As you float in the water and a wave goes by, what does your body do as the wave passes?
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![Page 8: I can: compare and contrast different types of wave Do Now: What do you know about waves? Draw a concept web.](https://reader035.fdocuments.net/reader035/viewer/2022081519/56649d885503460f94a6d9f1/html5/thumbnails/8.jpg)
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Parts of a Transverse WaveThere are 4 main parts to a transverse wave:
• Crest- the highest point on a transverse wave
• Trough- the lowest point on a transverse wave
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• Amplitude- the distance from either the crest or trough to the resting point of the wave
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• Wavelength- distance from crest to crest or trough to trough on a wave
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Wave Frequency• Frequency is a property of a wave, not a
part of one.
• Frequency is the number of waves which pass a given point in 1 second.
• Hertz (Hz) is the SI unit for frequency.
1 Hz = 1 wave passing a given point in
1 second
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Compressional Waves A compressional wave vibrates in the
direction that the wave is travelling. These waves are also known as longitudinal waves.
Examples: slinky, sound waves
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• The 2 main parts of a compressional wave are:A. Compression- area of higher density
within the wave
B. Rarefaction- area of lower density
within the wave
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I can: Describe how sound waves are created
Do Now: Compare and contrast the two waves in terms of their amplitude, wavelength, and frequency
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Amplitude –height of wave
Wavelength –length of wave from crest to crest or trough to trough
Frequency –how many waves pass per second
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Sound Waves
Sound waves type of compressional wave requires a medium material through which
a wave transfers energy.Caused by vibration of particlesSound waves travel at about 750 mi/h or
335 m/s it depend on the medium
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Velocity = Frequency x Wavelength
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• If a sound wave (335 m/s) has a frequency
of 67 Hz, what is its wavelength?
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Velocity = Frequency x Wavelength
so
Wavelength = Velocity / Frequency
= 335 m/s / 67 Hz
= 5 m
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Light waves• They are transverse waves• Travel about 300 million meters per second or
186,000 miles per second• Also called electromagnetic waves• Light consists waves of different wavelengths
– These create the colors of the rainbow
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The colours of the rainbow:
• Red• Orang
e• Yellow• Green• Blue• Indigo• Violet
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Seeing colour• The colour an object appears depends on the colours
of light it reflects.
For example, a red book only reflects red light:
White
lightOnly red light is reflected
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Reflection and Refraction• Reflection is where a wave strikes an object and
bounces off.
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The Law of Reflection
• The law of reflection states that the angle of incidence is equal to the angle of reflection on a flat reflective surface.
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Examples of the Law of Reflection:
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Refraction is the bending of a wave as it enters a different medium, due to a change in speed.
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• Because of light refraction, a person bow fishing would not aim directly at the fish. Where should they aim? Hmmmm………..
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Diffraction• Diffraction is the bending of a wave, around a
barrier.