Physics - Waves

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Physics

EoY Exam Revision

9th

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34 Terms

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True
True or false, waves transfer energy without transferring matter
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Transverse
Which type of waves move at 90° to the vibration of the particles?
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Longitudinal
Which type of waves move parallel to the vibration of the particles?
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Compression
What is the name for close particles in a longitudinal wave?
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Rarefaction
What is the name for far apart particles in a longitudinal wave?
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Hz
Frequency is measured in…
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metres
Wavelength is measured in…
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m/s
Wave speed is measured in…
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Frequency
The number of waves that pass in one second
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Wavelength
The distance between two identical parts of a wave
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Wave speed
How fast a wave travels
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Peak/crest
What is the top of a wave called?
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Trough
What is the bottom of the wave called?
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Amplitude
The distance from the midpoint of a wave to its top/bottom
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Wave speed
_________= frequency x wavelength
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Ai = Ar
What is the law of reflection?
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Refraction
The bending of light due to a change in its speed between the substances are different densities
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Diffraction
The spreading out of waves as a result of passing through a narrow gap
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Greatest
Diffraction is ________ (greatest/least) when the size of the gap is equal to the wavelength
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300 million m/s
The speed of light is…
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330 m/s
The speed of sound is…
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20 - 20,000 Hz
The normal range for a human is…
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Ultrasound
Any sound with a higher frequency than 20,000 Hz is known as…
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No
Can sound travel through a vacuum?
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Yes
Can light travel for a vacuum?
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Electromagnetic spectrum
What is the name for the following spectrum: radio waves, microwaves, infrared waves, visible light, ultraviolet, x-rays, gamma rays
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Most
Gamma rays are the ______ (most/least) penetrative of the waves in the EM spectrum
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Radio waves
Uses: radio and TV signals, Bluetooth, astronomy
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Microwaves
Uses: satellite signals, mobile phones, microwave ovens; harms: body heating (can lead to cancer)
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Infrared waves
Uses: thermal cameras, remote controls; harms: skin burns
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Visible light
Uses: vision, photography
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Ultraviolet light
Uses: detection of fake banknotes, sunbeds; harms: skin cancers, eye damage
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X-rays
Uses: medical scanning, security scanning; harms: mutations (lead to cancers), cell damage
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Gamma rays
Uses: cancer treatment, sterilisation; harms: mutations (lead to cancers), cell damage