light energy. crest -highest point of a wave. crest trough trough - low point of a wave
TRANSCRIPT
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Light Energy
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Crest -Highest point of a wave.
Crest
Trough
Trough - low point of a wave.
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Wavelength
The distance between one crest to the next crest or the distance between one trough to the next.
wavelength
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Amplitude
The height of the wave that indicates how much energy is carried by the wave.
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Types of Waves
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Transverse Waves
Waves move up and down in patterns that have high points called peaks.
The vibration is across the direction of the wave.
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Compression Wave
Energy travels back and forth in the same direction that the wave is moving.
Sound travels in a compression wave.
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Electromagnetic
A special type of transverse wave; energy that travels through space at 300,000,000 meters per second
(Speed of Light)
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Electromagnetic Spectrum
Arrangement of electromagnetic waves by wavelengths and frequencies.
Spans from short wavelength, high frequency, high energy waves to long wavelength, low frequency, low energy waves.
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Light is part of the electromagnetic spectrum.
The electromagnetic spectrum is a wave of energies with different frequencies.
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Light is a form of energy that travels in electromagnetic waves.
It is the fastest mode of travel.
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Light can travel through EMPTY space.
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Electromagnetic SpectrumVisible Spectrum – Light we can see
Roy G. Biv – Acronym for Red, Orange, Yellow, Green, Blue, Indigo, & Violet.Largest to Smallest Wavelength
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Your teeth absorb more of the X-ray energy than the rest of the mouth. The amounts of energy in different places make a picture of your teeth on the film.
Invisible Spectrum (Cont.)X-Rays
Def. - EM waves that are shorter than UV rays. Uses: Medicine – Bones absorb
x-rays; soft tissue does not. Lead absorbs X-rays.
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Short Wavelength Microwave
Invisible Spectrum (Cont.)Infrared Rays
Def – Light rays with longer wavelength than red light.Uses: Cooking, Medicine, T.V. remote controls
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The ultraviolet rays in sunlight can harm the skin.
Invisible spectrum (cont.).Ultraviolet rays.
Def. –EM waves with frequencies slightly higher than visible lightUses: food processing & hospitals to kill germs’ cellsHelps your body use vitamin D.
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Invisible spectrum (cont.)Gamma rays
Def. Highest frequency EM waves; Shortest wavelength. They come from outer space. Uses: cancer treatment.
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Radio waves are not sound waves, but you can use a radio to hear music and voices.The radio and its speakers convert radio waves to an audio signal and then into sound waves.
Invisible SpectrumRadio Waves
Def. – Longest wavelength & lowest frequency.Uses – Radio & T.V. broadcasting.
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Waves carry different amounts of energy.
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Light and Sound Energy are both forms of wave energy.
How are light and sound energy different?
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Light waves can travel through empty space, but sound waves need a medium to carry them.
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Microwaves are higher in energy than radio waves because they have a higher frequency.
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What do all waves have in common?
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All waves carry energy.