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Which of the following statements about apparent and absolute magnitudes is true?
A) A star's absolute magnitude is the apparent magnitude it would have if it were at a distance of 10 parsecs from Earth. B) The magnitude system that we use now is based on a system used by the ancient Greeks over 2,000 years ago that classified stars by how bright they appeared. C) A star with an apparent magnitude of 1 appears brighter than a star with an apparent magnitude of 2. D) The absolute magnitude of a star is another measure of its luminosity. E) All of the above are true.
A star is moving towards the earth with a speed at 90% the speed of light. It emits light, which moves away from the star at the speed of light. Relative to us on earth, what is the speed of the light moving toward us from the star?
A) 0.90c B) c C) 1.1c D) 1.20c E) 1.9c
In general, the spectral lines of molecules are
A) more complex than those of atoms. B) less complex than those of atoms. C) only absorption lines. D) the same as the atoms they contain. E) nonexistent.
Our Moon in Earth orbit travels fastest when it is
A) involved in an eclipse. B) rotating. C) revolving. D) closest. E) all of the above