using waves

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vibrate perpendicualr to the direction of energy transfer. electromagnetic waves.
transverse waves
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vibrate parallel to the direction of energy transfer. sound waves.
longitudinal waves
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distance from peak to peak or trough to trough.
wavelength
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number of waves passed divided by time.
frequency
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frequency times wavelength.
wave speed
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a continuous spectrum of electromagnetic waves.
electromagnetic spectrum
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10 to the power of 4 metres. Used for communication.
radio waves
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10 to the power of -2 metres. used to vibrate water molecules in food. might cause unwanted heating of the body.
microwaves
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10 to the power of -5 metres. used for remote controls. Can cause burns.
infrared
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10 to the power of -7 metres. used for making images.
visble light
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tanning, looking at the skeleton, used for radiotherapy ( cancer treatment) all 3 can cause cancer.
ultraviolet, x-rays and gamma rays.
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an image is formed ina plane flat mirror when the incident rays goes towards the mirror and the reflected ray comes away from the mirror.
reflection
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as a beam of light enters the glass block it slows down but when the beam changes direction away from the nromak the wavlength increases.
refraction
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the wave spreads out as it passes through a gap. The smaller the gap the more bendy the waves will be. The bigger the gap the less bendy the waves will be.
diffraction
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the pitch of a note increases if the frequency of a sound wave increases.
how frequency relates to pitch
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sound waves that can be reflected.
echo
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when the wavelength and frequency of the waves detected by the observer shift from the original produced by the source.
doppler effect
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red shift provides evidence that the universe is expanding. light from distant galaxies. frequency has decreased. Wavelength has increased.
how the evidence from red shift supports the big bang theory
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radiation produced by the big bang. As the universe expanded higher energy gamma radiation would have become lower gamma energy radiation.
cosmic microwave background radiation.
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Other cards in this set

Card 2

Front

vibrate parallel to the direction of energy transfer. sound waves.

Back

longitudinal waves

Card 3

Front

distance from peak to peak or trough to trough.

Back

Preview of the front of card 3

Card 4

Front

number of waves passed divided by time.

Back

Preview of the front of card 4

Card 5

Front

frequency times wavelength.

Back

Preview of the front of card 5
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