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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter Twelve, Beyond Strings, In Search of M-Theory.

Multiple Choice Questions

1. How many total dimensions are required by string theory?
(a) Seven.
(b) Eight.
(c) Ten.
(d) Five.

2. What is the photoelectric effect?
(a) Photons can spontaneously decay into electrons in powerful magnetic fields.
(b) Electrons follow quantum paths made by photons.
(c) When light shines on metals, the metals emit electrons.
(d) Electrons and photons only interact if they have the same frequency.

3. The smallest possible unit of energy is referred to as _____.
(a) A photon.
(b) A muon.
(c) A quantum.
(d) A quark.

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

5. Under string theory, which of the following is true regarding extra dimensions?
(a) Some or all of them might be time-dimensions.
(b) They must all be space-dimensions.
(c) They must all be space-dimensions, or they must all be time-dimensions.
(d) They must all be time-dimensions.

Short Answer Questions

1. The extra dimension or dimensions in M-theory are needed in order to incorporate _____.

2. How does the shape of the extra "curled up" dimensions affect the vibration of strings?

3. Kaluza-Klein theory units which two fundamental forces?

4. Kaluza's theory suggested that electromagnetism was carried by ripples in _____.

5. What is the importance of the string-coupling constant?

(see the answer key)

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