A quasar in a galaxy that is merging with another galaxy would be
A) the source of a gamma ray burst.
B) less luminous because of the loss of material to tidal debris during the merger.
C) more luminous because of a greater supply of fuel.
D) destroyed in the process of the merger.
E) the source of a Type Ia supernova explosion.
Ans: C) more luminous because of a greater supply of fuel.
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Suppose you have three identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of its brightness. You add a second lightbulb, connecting it in parallel with the previous lightbulbs, and again take note of the brightness. Repeat the process with the third lightbulb, connecting it in parallel with the other two. As the lightbulbs are added, the
lifetime of the battery (Neglect the battery’s internal resistance.) 1.increases. 2.decreases. 3.remains the same. 4.Need more information.
Plane polarized light is sent through two consecutive polarizers, the first having its plane of polarization in the same direction as the incident light and the second having its plane at 90° to the original plane of polarization. A third polarizer, with plane of polarization at 60° to the original plane of polarization, is placed between the two other polarizers. What fraction of the original
intensity now gets through? a. 0.56 c. 0 b. 0.19 d. 0.25
Steven Weinberg, Abdus Salam, and Sheldon Glashow shared the 1979 Nobel prize in physics for their development of a(n)
a. electroweak theory b. GUT c. quark theory d. generalized theory of relativity e. theory of strangeness
The unstable isotope 234Th decays by ? emission with a half-life of 24.5 days. The initial decay rate of the sample was 9.9 × 1013 Bq. (1 u = 1.6605 × 10-27 kg)
(a) What mass of 234Th was initially present? (b) What is the decay rate after 68 days? What will be an ideal response?