# 2 - -Doppler Effect Measure motion Chapter 5 Our Sun The...

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Lambda = 658 (observed wavelength) The change in wavelength is: [delta lambda = lambda – lambda 0 = 2nm [Delta lambda/lambda 0 = Vr/C] We find Delta lambda/ lambda 0 = 2nm/656 = 0.003 = 3 x 10^-3 Vr/C = Delta Lambda/ Lambda 0 = .003 Vr=0.003 x c Vr= 0.003 x (300,000 km/s) = 900 km/s The star is receding from us at 900km/s Doppler Effect: Applications - The Doppler Effect can be used to measure if something is in motion, and how fast it is moving. - Police: speeding tickets - Weather: Doppler Radar - Astronomy: Motion of stars, including planet detection. Chapter 4 Summary - Wien’s Law: Measure Temperature - Bohr Model - Atoms and Light - How a spectrum is formed.
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Unformatted text preview: -Doppler Effect: Measure motion Chapter 5 - Our Sun The Sun : Our nearest Star-The sun is a star-Because it is so close, we can study it carefully-We can apply what we learn to other stars.-The sun is an average star. 1. Some stars are larger, some smaller. 2. Some stars are brighter, some dimmer 3. Some stars are older, some younger Sun’s General Properties-The sun is an average star-It only appears so bright because it is so close.-It is 109 times larger than earths. -333,000 times earths mass. -Consists entirely of gas-Surface temperature = 5800 K (Kelvin)-Central Temperature = 15 million K (Kelvin)...
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## This document was uploaded on 10/07/2011.

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