The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest For… Test | Mid-Book Test - Easy

Brian Greene
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This test consists of 15 multiple choice questions and 5 short answer questions.

Multiple Choice Questions

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

2. Quantum electroweak theory concerns quantum mechanics and _____.
(a) The strong force.
(b) Gravity.
(c) The weak force.
(d) The electromagnetic force.

3. What characteristic did Werner Heisenberg discovered that some features of the universe at very small scales, and some properties of particle?
(a) They are dependant on the velocity of the object being studied.
(b) They can change spontaneously, with no external influence.
(c) They always increase or decrease by certain increments.
(d) They cannot be known with complete precision.

4. Which of the follow best describes a boson?
(a) A particle of energy, a messenger particle for a force.
(b) A particle of matter.
(c) The super-partner of a proton.
(d) The supersymmetric version of a proton.

5. What is quantum foam?
(a) The faint material ejected by black holes.
(b) The mixture of short-lived particles observed after a matter and anti-matter collision.
(c) Particles that are scattered from their normal positions by quantum interference.
(d) The rapidly changing spatial distortions at the Planck length.

6. 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.

7. What would an outside observer notice about an object moving near the speed of light?
(a) It would be shorted in the direction of its movement.
(b) It would not be observable under any circumstances.
(c) It would appear to move slower near a gravitational field.
(d) It would appear vastly larger than it would at rest.

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

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

10. What property of electromagnetic waves did Max Planck solve the thermodynamic problem of the oven by discovering?
(a) There are infinite numbers of waves, but each has an infinitely small energy.
(b) They can penetrate or "tunnel" through any surface.
(c) Waves are really particles.
(d) They have a minimum energy, proportional to their frequency.

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

12. Richard Feynman's "sum over paths" theory states that in the double-slit experiment, an electron behaves in what way?
(a) It follows a unique path every time.
(b) The sum of all possible frequencies describes the frequency of the final path taken.
(c) It follows the same path every time.
(d) It follows all possible paths at the same time.

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

14. Who discovered the theory of general relativity?
(a) Isaac Newton.
(b) Max Planck.
(c) Richard Feynman.
(d) Albert Einstein.

15. Which of the following is true of a particle's spin?
(a) It is constant for that particle.
(b) It depends on the strength of the local magnetic field.
(c) It increases with each interaction with a particle of greater spin.
(d) It changes depending on the particle's energy.

Short Answer Questions

1. What is the quantum, or messenger particle, of the weak force?

2. Which of the following is not true according to special relativity?

3. How are the wavelength of a string's vibration and the mass of the particle it represents related?

4. The wave-like nature of the electron means that after a collision, _____.

5. What is the Planck tension?

(see the answer keys)

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