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# The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest For… Quiz | Four Week Quiz B

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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter Thirteen, Black Holes, A String/M Theory Perspective.

## Multiple Choice Questions

1. What are the characteristics of a wave?
(a) Frequency, wavelength, and amplitude.
(b) Amplitude and energy.
(c) Energy level, polarity, and speed.
(d) Frequency, polarity, and wavelength.

2. Black holes are dense and massive cosmological bodies. What unique distinction do they have?
(a) Neutrinos always flow towards them.
(b) Light cannot escape their gravitational well.
(c) They are the only types of stars that can produce uranium and heavier elements.
(d) They are the only objects that emit gamma rays.

3. Which of the following is true regarding the amount of visible matter in the universe compared to the amount of matter required to cause collapse of the universe?
(a) It almost exactly equals the mass needed.
(b) It makes up a very small percentage of the mass needed.
(c) It makes up about half the mass needed.
(d) There is much more of it than is needed to cause collapse.

4. What characteristic of the string determines the properties of the particle it represents?
(a) The number of other strings with which it is threaded.
(b) Its mass.
(c) Its frequency of vibration.
(d) Its length.

5. When the distance between two objects is doubled, what happens to the strength of the gravitational pull between them?
(a) It is unchanged.
(c) It diminishes to one-half its original value.
(d) It diminishes to one-fourth its original value.

1. Richard Feynman's "sum over paths" theory states that in the double-slit experiment, an electron behaves in what way?

2. Under string theory, which of the following is true regarding extra dimensions?

3. What prevents the potentially dangerous effects of an exposed tear in space-time?

4. What metric best approximates the scales at which extra dimensions would have a major impact?

5. Which of the following is true regarding tears in space time occurring in normal three-dimensional space?