What is a spectroscopic binary?
A. a visual binary in which one or both stars have peculiar spectra
B. A spectroscopic binary looks, to us on Earth, like a single star, but its spectrum shows double lines that shift.
C. a visual binary for which we have spectra of both stars
D. a visual binary that is shown by its spectrum to be a single star
Answer: B
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Compton Scattering: A 29.0-pm-wavelength photon is scattered by a stationary electron. What is the maximum energy loss the photon can have? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 4.0 keV B. 6.1 keV C. 10 keV D. 12 keV E. 15 keV
Spectroscopy of a star can reveal its temperature, composition, and line-of-sight motion
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What is the kinetic energy of a proton moving at 0.8000 c? The rest energy of a proton is 938.3 MeV.
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