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This quiz consists of 5 multiple choice and 5 short answer questions through Chapter 5, The Need for a New Theory, General Relativity vs. Quantum Mechanics.

Multiple Choice Questions

1. According to Newton's theory of gravity, if two objects have a gravitational pull on one another, and one changes its mass or distance from the other, how quickly does the effect of this change travel to the other object?
(a) Instantaneously.
(b) At exactly the speed of light.
(c) Near the speed of light, faster for lighter objects.
(d) Near the speed of light, faster for more massive objects.

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

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

4. According to special relativity, which of the following can move faster than light?
(a) Gravitational waves.
(b) Quantum data.
(c) Nothing can move faster than light.
(d) Neutrinos.

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

Short Answer Questions

1. How can black holes be detected?

2. What characteristic of the string determines the properties of the particle it represents?

3. According to special relativity, which of the following is true about the passage of time for an observer moving near the speed of light?

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

5. Which of the following did Einstein considered time?

(see the answer key)

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