Absolute visual magnitude is

a. the apparent magnitude of a star observed from Earth.
b. the luminosity of a star observed from a distance of 1000 pc.
c. the apparent magnitude of a star observed from a distance of 10 pc.
d. the luminosity of a star observed from Earth.
e. c and d


C

Physics & Space Science

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A highly reliable laser emits a steady beam of light at a fixed frequency f that hits a photodetector a light year away in what we can assume is empty space. The laser/detector setup is now placed as a system with a black hole directly behind the laser. What happens to the frequency of the light beam?

a. The detector measures the frequency of the beam as less than f. b. The detector measures the frequency of the beam as greater than f. c. The laser emits light at a frequency less than f (as measured at the laser) d. The laser emits light at a frequency greater than f (as measured at the laser) e. Both a and c

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