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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter 9 The Arrow of Time.

Multiple Choice Questions

1. What travels at the speed of 186,000 miles per second?
(a) Waves.
(b) Electrons.
(c) Sound.
(d) Light.

2. What scientific feat led to the introduction of imaginary time?
(a) Trying to unite the concept of black holes and the big bang.
(b) Trying to unify gravity with quantum mechanics.
(c) Trying to create a testable hypothesis for the big bang.
(d) Trying to unify small forces with the theory of relativity.

3. What might escape from a black hole?
(a) Photons.
(b) Gamma rays.
(c) Something with more gravitational force than a black hole.
(d) Nothing.

4. To observe black holes you must observe what?
(a) Their effects.
(b) Their mass.
(c) Their distance from the nearest star.
(d) Their cause.

5. What does the letter C stand for in combinations of operations?
(a) Changing heavy particles for light particles.
(b) Changing matter particles for virtual particles.
(c) Changing particles for antiparticles.
(d) Changing positive particles for negative particles.

Short Answer Questions

1. Who discovered the theory of gravity?

2. What is the fate of black holes according to Hawking's model of the universe?

3. As a consequence of quantum mechanics, waves sometimes behave like what?

4. What is one of the categories of force-carrying virtual protons?

5. Scientists try to create explanations for the way the universe works that always do what?

(see the answer key)

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