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

2. Which of the following is one of the major problems in using both quantum physics and general relativity?
(a) Quantum physics predicts that all particles are massless.
(b) At small scales, quantum physics predicts uncertainty, but general relativity requires certainty.
(c) General relativity is a wave theory, but quantum physics is a particle theory.
(d) General relativity is time-dependant, quantum physics is a steady-state theory.

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

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

5. Which of the following is closest to the Planck length?
(a) A millionth of a centimeter.
(b) A thousandth of a centimeter.
(c) A billionth of a billionth of a centimeter.
(d) A millionth of a billionth of a billionth of a billionth of a centimeter.

Short Answer Questions

1. What rule did Max Planck discover the electromagnetic waves bounded in a container, such as an oven, must follow?

2. Edwin Hubble used Einstein's theories to show that the fabric of the universe _____.

3. Which of the following is not one of the four fundamental forces of the universe?

4. According to general relativity, all objects that have mass have what effect on space-time?

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

(see the answer key)

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