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24.1 Electromagnetic Spectrum

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Sarah Holland

on 4 May 2011

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Transcript of 24.1 Electromagnetic Spectrum

The study of the sun is based on analyzing light from distant sources ELECTROMAGENTIC SPECTRUM the arrangement of electromagnetic radiation according to wavelength. All waves in space travel at speed of light = 300,000 km/sec (26 billion km/day)
Different colors of light depend on wavelength
Wavelength - the distance from one wave crest to the next
a star will give off a characteristic spectrum (wavelengths) that indicates the chemical composition of that star
Visible light has wavelengths of 380-750 nm
-Shorter wavelengths (380-500 nm) look BLUE
-Longer wavelengths (640-750nm) look RED Prisms can be used to separate white light into individual colors
DOPPLER EFFECT – change in wavelength of a wave that is emitted from a moving source
Object that is moving toward you will have a decreasing wavelength
+waves are getting shorter
+shifts toward blue end of light spectrum (BLUE SHIFT) Object that is moving away from you will have an increasing wavelength
+waves are being lengthened
+shifts toward the red end of light spectrum (RED SHIFT)
Doppler Shift Rates
-Rate of shift can also be measured to tell you how fast the object is traveling
Gamma Rays X-Rays Ultraviolet Rays Visible Light Infrared microwaves Radio Waves +larger Doppler shifts (changes in wavelengths) indicate higher speeds
+smaller Doppler shifts indicate slower speeds HOMEWORK:
1, 3 and 4 on Page 677
(answer in notes)
24.1 Worksheet
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