Electromagnetic radiation

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Presentation transcript:

Electromagnetic radiation http://www.nfb.ca/web428x321/Films/50630/50630_1.jpg The many waves that surround you every second of your life. But you wouldn’t live without them.

Types of electromagnetic radiation

Expectation 1: Definition http://www.photobiology.info/graphics/photochem03.gif A form of energy that moves through space as a wave with two components; electric & magnetic. These waves oscillate at a 90o angle.

Expectation 2: Wave properties From Prentice Hall publishers Wavelength (l) – the distance between two identical successive points on a wave; unit is m Amplitude – the distance a wave moves from the midpoint or origin; unit is m (Crest is the top of the wave & trough is the bottom of the wave) Frequency (u) – the number of waves (or oscillations) that pass a point per second; unit is 1/s or Hz Energy (E) – the capacity the wave has to cause change or do work; unit is Joule

Relationship between properties From Prentice Hall Publishers A long wavelength has a low frequency & low energy. A short wavelength has a high frequency & high energy. Amplitude does not affect wavelength, frequency or energy. As amplitude increases intensity (brightness) increases.

Equations c = l/u c is the speed of light (3.0 x 108 m/s) E = hu E represents the energy h represents Plank’s constant & is 6.626 x 10-34 J*s