If galaxy A is four times more distant than galaxy B, then according to the Hubble Law, galaxy A will recede ____ than galaxy B
a. 16 times faster
b. 4 times faster
c. 2 times faster
d. 1.2 times faster
e. 0.25 times faster
B
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The current through a piece of lab equipment must be limited to 2.75 A when it is run by a 120-V dc power supply. What must be the resistance of this equipment?
What will be an ideal response?
Which statement about Schwarzschild radii is true?
A) The Schwarzschild radius of a black hole can be defined only in binary systems. B) The more massive the black hole, the smaller the Schwarzschild radius. C) The Schwarzschild radius of a black hole depends only on its mass. D) The Schwarzschild radius is used to describe the size of neutron stars.
If the Moon is rising at midnight, the phase of the Moon must be
A) first quarter. B) waxing crescent. C) third quarter. D) waning crescent. E) full.
An achromatic lens
a. is used to correct spherical aberration in reflecting telescopes. b. is used to correct chromatic aberration in refracting telescopes. c. is used to correct spherical aberration in refracting telescopes. d. is used to correct chromatic aberration in reflecting telescopes. e. contains two mirrors and focuses the light back through the primary mirror.