# P01-08 - P01.08 Astro Doppler (25.12) A distant star is...

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P01.08 Astro Doppler (25.12) A distant star is traveling directly toward Earth with a speed of 36500 km/s. When the wavelengths in this star's spectrum are measured on Earth, are they greater or less than the wavelengths we would find if the star were at rest relative to us? (b) By what fraction are the wavelengths in this star’s spectrum shifted? Strategy: Replace the frequency in equation 25-3 with the wavelength given in equation 25-4. Solve the resulting expression for the shifted wavelength divided by the unshifted wavelength. Solution: 1. (a) Because the star is moving toward Earth, the frequencies of the
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## This note was uploaded on 02/14/2009 for the course PHYS 1112 taught by Professor Seaton during the Spring '08 term at University of Georgia Athens.

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