The energy radiated from a typical quasar requires that its black hole accrete about:
A) 1 solar mass per 100 years.
B) 1 solar mass per 10,000 years.
C) 1 Jupiter mass per year.
D) 10 solar masses per year.
E) 1,000 solar masses per year.
D
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A quanton is in a situation where its potential energy decreases to the right. As we go to the right, the wavelength of its energy eigen function
A. Increases. B. Remains the same. C. Decreases. D. Is undefined
Which of the following observations is not a piece of evidence supporting the Big Bang theory?
A) darkness of the night sky B) recession speeds of far away galaxies relative to close ones C) observed helium abundance in the universe D) relative motions of galaxies in the Local Group
Which of the following is not evidence for the Big Bang?
A. The background of microwave radiation B. The expansion of the universe C. The ratio of hydrogen to helium observed in stars D. The existence of protons and neutrons
A railroad train travels forward along a straight track at 80.0 m/s for 1000 m and then travels at 40.0 m/s for the next 1000 m. What is the average velocity?
a. 60.0 m/s c. 63.7 m/s b. 37.5 m/s d. 53.3 m/s