Electromagnetic Radiation

Electromagnetic Radiation Chapter 28 Section 1

Electromagnetic Radiation

Energy radiated in the form of a wave,

resulting from the motion of electric charges and the magnetic fields they produce. All radiation travels in waves at 300,000

kilometers per second (speed of light) The length of the wave determines the characteristics of the electromagnetic radiation

Electromagnetic radiation consists of an electric wave (E) traveling and a magnetic wave (M)oriented at right angles to the electrical wave, both traveling at the speed of light (C)

Wavelength & Frequency

Wavelength is measured

by figuring the distance between two crests of a wave Frequency is measured by the number cycles a wave goes through in a given second 

Which example has a

larger wavelength? Which has a higher frequency?

Electromagnetic Spectrum

Spectroscopes Astronomers use spectroscopes or spectrometers involving some form of a prism to refract the incoming energy. This has become a useful tool to study far away stars

Spectrums When material or an object is heated, incandescent light (electromagnetic radiation ) is emitted. Specific materials give off specific light characteristic of the atomic makeup. 

Continuous Spectrum

Emission Spectrum

Absorption Spectrum

Continuous, Emission, and Absorption Spectrums

Doppler Effect

Redshift- Doppler effect of a star moving away

from Earth Blueshift- Doppler effect of a stay moving towards Earth

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