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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 253 with the wavelength given in
equation 254. 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.
 Spring '08
 SEATON
 Physics

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