# Diffraction Grating bends white light coming from an object

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Diffraction Grating bends white light coming from an object
separates the light into the wavelengths (colors) of the visible light spectrum

Electromagnetic Spectrum and Astronomic Distances
10/4/16 Electromagnetic Spectrum and Astronomic Distances Objective: I will diagram the electromagnetic spectrum. I will compare the different measurement units used to measure distances in space. PAGE 21

Light Light is electromagnetic energy travels in waves
photon- basic particle of light

Electromagnetic Spectrum
range of all the wavelengths of light given off by objects

Electromagnetic Spectrum
Radio Microwave Infrared Visible (ROY G. BIV) Ultraviolet X-ray Gamma

Microwave Used by astronomers to map the early universe

Infrared used to detect heat coming from objects

(ROY G. BIV) Visible Light light we can detect with our eyes Shorter
Longer Wavelength Shorter Wavelength (ROY G. BIV)

Ultraviolet given off by the Sun, causes sunburn

X-Ray helps in the field of medicine

Gamma Rays shortest wavelength, highest energy

Electromagnetic Spectrum and Astronomic Distances
10/4/16 Electromagnetic Spectrum and Astronomic Distances Objective: I will diagram the electromagnetic spectrum. I will compare the different measurement units used to measure distances in space. PAGE 21

Distances in Space In astronomy, scientists rarely use kilometers
too small! only use km for diameters of planets or how far away a moon is from the planet

Astronomical Unit the distance from the earth to the sun
1 AU = 93 million miles used to measure distances between planets

Light Year distance light travels in one year
measure of distance, NOT time Speed of light is 3 x 108 m/s

Light Year used to measure distances between stars and galaxies

Light Year If light travels 300,000 km/s, how far does light travel in one year? This distance you calculate is the distance of one light-year. Show all of your work and answers on page 20.

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