ELECTROMAGNETIC WAVE REVIEW

WAVES PROPERTIES REVIEW Amplitude“…is the maximum distance that the particles of the medium carrying the wave move away from their rest positions” (Pasachoff 13).

Wavelength“…the number of meters needed for the wave to repeat itself at a given moment of time” (McMillan 45).

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WAVES PROPERTIES REVIEW

Frequency“…is the number of complete waves that pass a given point in a certain amount of time” (Pasachoff 13).

Pitch: describes the frequency…a high frequency will have a high pitch and a low frequency will have a low pitch.

ELECTROMAGNETIC WAVES Transverse wave made up of electrical and magnetic energy It is produced when the electric and magnetic fields switch back and forth (vibrating) causing a disturbance that travels through space as a wave. This wave carries energy and information from one part of the universe to another, which is called electromagnetic radiation. Our instruments pick up these electromagnetic waves and change them into vibrating tunes/static Travel at the speed of light: 299,792.458 km/s in a vacuum

ELECTROMAGNETIC SPECTRUM• Video Clip: https://

www.youtube.com/watch?v=cfXzwh3KadE • “All electromagnetic waves travel at the same speed in

a vacuum, but they have different wavelengths and different frequencies” (Pasachoff 75).

• “…is the complete range of electromagnetic waves placed in order of increasing frequency” (Pasachoff 75).

• Radio waves, Infrared rays, Visible light, ultraviolet rays, X-rays, and gamma rays.

RADIO & INFRARED Radio WavesLongest wavelength and lowest frequencies

Broadcast waves and microwaves

Infrared RaysWavelength shorter than radio wavesThe invisible heat you feel

VISIBLE LIGHT You can see The longest wavelengths and lower frequencies appear in the red and the shortest wavelengths and higher frequencies appear in the violet/blue Violet Blue Green Yellow Orange Red

X-RAYS:Shorter wavelengths and higher frequencies than ultraviolet rays, thus can carry more energyCan go through most matter, except dense matter like bones

ULTRAVIOLET RAYS

Shorter wavelengths and higher frequencies than visible lightThey carry more energy than visible lightPros: killing bacteria and providing vitamin DCons: to much exposure causes skin cancer, can damage your eyes, and burn your skin

GAMMA RAYS:

Have the shortest wavelength and highest frequencies, thus has the greatest amount of energyGreat penetrating abilityPros: use to kill cancer cells inside the body, use to help see inside the bodyCons: nuclear reactions produce and can be harmful (even deadly if exposed to too much).

REVIEW QUESTIONS

Due:

1. What type of waves are used to transmit cellular telephone messages?

a) Gamma raysb) Radio Waves/microwavesc) X-raysd) Visible light

2. Which electromagnetic waves have the shortest wavelengths and highest frequencies?

a) Gamma raysb) Radio wavesc) X-raysd) Ultraviolet rays

1. Electromagnetic waves that you can see are called?a) Infrared raysb) Microwavesc) X-raysd) Visible light

2. Which of the following enables your body to make vitamin D?a) Ultraviolet radiationb) Infrared wavesc) Gamma raysd) Visible light

1. Electromagnetic waves that you can feel as heat?a) Infrared raysb) Microwavesc) X-raysd) Visible light