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

Physics & Space Science

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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

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science