If you find that the hydrogen alpha line in a star's spectrum occurs at a wavelength of 656.45 nm, what is the star's approximate radial velocity? Note that the rest wavelength of this line is 656.30 nm. A. 70 km/s toward you B. 150 km/s away from you

If you find that the hydrogen alpha line in a star's spectrum occurs at a wavelength of 656.45 nm, what is the star's approximate radial velocity? Note that the rest wavelength of this line is 656.30 nm. A. 70 km/s toward you B. 150 km/s away from you

Astronomy

1st Edition

ISBN:9781938168284

Author:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Publisher:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Chapter19: Celestial Distances

Section: Chapter Questions

Problem 17E: Which of the following can you determine about a star without knowing its distance, and which can...

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The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.

Question

#49

If you find that the hydrogen alpha line in a
star's spectrum occurs at a wavelength of
656.45 nm, what is the star's approximate radial
velocity? Note that the rest wavelength of this
line is 656.30 nm.
A. 70 km/s toward you
B. 150 km/s away from you

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