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. the apparent magnitude of a star observed from a distance of 10 pc and the luminosity of a star observed from Earth.
c
You might also like to view...
The Dynamo Theory holds that
A) lightning plays a major role in generating our magnetic fields. B) any other planet of similar density will also have a strong magnetic field. C) the Earth's core, like Mercury's, is now a solid, rigid bar magnet. D) magnetic fields are generated by rapidly spinning, fluid magnetic interiors. E) the Earth's magnetic field must switch polarities every few million years.
Halley's Comet returns about every ______________ years
a. 4 b. 12 c. 1000 d. 10,000 e. 76
One light-year is approximately
A) the distance from the Sun to Earth. B) the speed at which Earth orbits the Sun. C) 10 trillion kilometers. D) the same as one regular year.
Which draws more current, a 60-W or a 100-W incandescent lamp, both rated for 120-V operation?
A) 60-W lamp B) 100-W lamp C) both the same