What is Hawking radiation?
A) a hypothesized way for black holes to gradually shrink in mass
B) a type of high-energy radiation that comes from inside a black hole's event horizon
C) a type of radiation coming from objects supported by degeneracy pressure
D) a type of radiation that we have detected so far only with infrared telescopes in space
A) a hypothesized way for black holes to gradually shrink in mass
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Modern evidence based on what can be determined about the products of nuclear reactions in the first few minutes after the big bang shows that dark matter:
A) does not have any density. B) does not exist. C) is not present in galaxies. D) is not baryonic.
In the Ptolemaic model of the solar system, Venus should exhibit which of the following phases?
A) crescent B) new C) full D) A and B E) B and C
At what rate is thermal energy generated in the 30-? resistor?
a.
20 W
b.
27 W
c.
60 W
d.
13 W
e.
30 W
The temperature of the mesosphere decreases from 0°C at the bottom to -90°C at the top. This change in temperature is a result of
A) a decrease in air pressure. B) low absorption of solar radiation—air molecules emit more energy than they absorb. C) low air density. D) all of these