At what frequency will the capacitive reactance of a 0.010-?F capacitor be 100 ??
A) 0.31 MHz B) 0.16 MHz C) 1.0 kHz D) 16 kHz
B
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Which of the following statements about novae is true?
A) A star system that undergoes a nova may have another nova sometime in the future. B) A nova involves fusion taking place on the surface of a neutron star. C) A nova is the most powerful type of explosion ever seen in the universe. D) When a star system undergoes a nova, it brightens as much as a star system undergoing a supernova. E) A nova can occur on a single, isolated star.
Eta Carinae is an example of a
A) black hole. B) supermassive star. C) red dwarf. D) nebula. E) stellar nursery.
The axes on a Hertzsprung-Russell (H-R) diagram represent ________
A) mass and radius B) luminosity and surface temperature C) mass and luminosity D) luminosity and apparent brightness
What observation has prompted astronomers to ponder the possible existence of dark energy?
a. Discovery of quasars b. Discovery of superclusters c. Supernovae appear fainter than expected at large redshifts. d. Uniform nature of the cosmic microwave background (CMB).