Why did the quasar epoch end?
What will be an ideal response?
Mergers declined and there was little fuel left to power the quasars.
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Which of the following statements about the Moon is not correct?
A. The acceleration due to gravity on the Moon is weaker than on Earth. B. Earth's gravitational pull on the Moon equals the Moon's gravitational pull on Earth. C. There is a net force acting on the Moon. D. The Moon is not accelerating.
Monochromatic light (? = 500 nm) is incident on a soap bubble (n = 1.4) that is 50 mm thick. What is the change of phase of the light reflected from the front surface?
A. 0 B. 180° C. ?/2 D. ?/2 E. 55°
Using K = 3/2 kT, what is the average kinetic energy of a He atom at:
(a) 10. K? (b) -196.°C? (c) 100.°C?
The analytical procedure that bombards a sample with neutrons and measures the frequency of gamma rays emitted is called
a. the alpha scattering technique. b. carbon dating. c. neutron activation analysis. d. Geiger counting.