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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter Fifteen, Prospects.

Multiple Choice Questions

1. According to string theory, what is the fabric of space-time made of?
(a) It does not really exist.
(b) An enormous three-brane.
(c) Calabi-Yau spaces.
(d) The coherent state of strings.

2. The wave-like nature of the electron means that after a collision, _____.
(a) The electron has a range of possible locations.
(b) The electron will double in frequency.
(c) The electron can never be located again.
(d) The electron will disperse into a wave of energy.

3. According to Newton's law of gravity, the strength of the pull between two objects depends on what factors?
(a) The distance between them and their average atomic numbers.
(b) Their masses and the distance between them.
(c) Their masses and potential energies.
(d) Their densities and the strength of the gravitational field they occupy.

4. Which of the following is not one of the four fundamental forces of the universe?
(a) Gravity.
(b) The nuclear-weak force.
(c) The electromagnetic force.
(d) The photoelectric force.

5. What is the quantum, or messenger particle, of the strong force?
(a) The muon.
(b) The baryon.
(c) The gluon.
(d) The hadron.

Short Answer Questions

1. Which of the following is NOT an actual version of string theory?

2. What is the shape of all particles, at the smallest possible level, according to string theory?

3. What two major branches of modern physics does string theory incorporate?

4. What is one possible way that the three dimensions we observe could have been "stretched out"?

5. What property does an external black hole have?

(see the answer key)

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