If a spherical concave mirror has a radius of curvature R, its focal length is
A) R/4.
B) R/2.
C) R.
D) 2R.
E) 4R.
B
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Most active galactic nuclei are found at large distances from us, with relatively few nearby. What does this imply?
A) Active galactic nuclei exist tend to become less active as they age. B) Supermassive black holes existed only when the universe was young, and no longer exist today. C) Active galactic nuclei can form only at large distances from the Milky Way. D) The jets seen in many active galactic nuclei must cause them to move far away from us.
Why do rich clusters of galaxies contain a larger fraction of ellipticals than normal?
What will be an ideal response?
Solar power is used in many parts of the world for
A) heating water. B) generating electricity. C) both of these D) neither of these
If the Earth had twice its present radius and twice its present mass, what change in weight would you experience? Explain
What will be an ideal response?