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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter 6, Nothing but Music, The Essentials of Superstring Theory.

Multiple Choice Questions

1. Edwin Hubble used Einstein's theories to show that the fabric of the universe _____.
(a) Is not static, it must either be shrinking or expanding.
(b) Is not flat, it is curved, either inwards or outwards.
(c) Has a finite boundary.
(d) Is uniform in all places and times.

2. What discovery about string theory triggered the "superstring revolution"?
(a) It was experimentally confirmed at Fermilab in the US.
(b) It was found to encompass the four fundamental forces of matter.
(c) Its approximate equations were solved for the first time.
(d) Einstein announced that it exactly matched his formulas for general relativity.

3. In 1968 it was discovered that protons and neutrons are composed of which type of particle?
(a) Quarks.
(b) Muons.
(c) Baryons.
(d) Neutrinos.

4. What is the shape of all particles, at the smallest possible level, according to string theory?
(a) A thread of thin strings.
(b) A one-dimension loop.
(c) An infinitely long string.
(d) A tangled ball of thin filament.

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

Short Answer Questions

1. Which of the following is correct about the speed at which light moves?

2. Which of the following is closest to the Planck length?

3. What is the Planck tension?

4. Black holes are dense and massive cosmological bodies. What unique distinction do they have?

5. When the distance between two objects is doubled, what happens to the strength of the gravitational pull between them?

(see the answer key)

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