astronomy chapter 21 page 583 space exploration radiation from space – the electromagnetic...
TRANSCRIPT
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Astronomy
• Chapter 21 page 583
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Space Exploration
• Radiation from Space – the electromagnetic spectrum ( EM spectrum)
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EM Spectrum
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EM Spectrum
• Visible Light ROYGBIV( Wavelength = 300 – 720 nm)
OR 3000 to 7200 Angstroms
Red - Orange – Yellow – Green-
Blue – IndigoIndigo - VioletViolet
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Wavelength
• Wavelength is the distance from crest to crest. The SI unit is meters or nanometers (nm). Angstroms are another unit.
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Claude Monet
Impressionists painted the effects of light.
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EM Spectrum Long Wavelengths
• Radio waves
• Microwaves
• Infrared
( Then Visible Light)
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EM Spectrum SHORT Wavelengths
• Ultraviolet ( UV)
• X-rays
• Gamma rays
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EM Radiation : From the SUN and all STARS
• All stars give off electromagnetic radiation ( x-rays, gamma, microwaves, etc.)
• Speed of Light = 300,000 km/second
OR 186,000 mile/sec
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How Fast is Light?
• Speed of sound = about 700 mi/hr
• Speed of sound is only 0.2 mi/sec
• Space shuttle flies at Mach 25 ( 17,500 mi/hr)
• This is only 5 miles /second…slow as compared to light!