Practice Quiz

MCAS Physics Exam Practice

Category - Introductory Physics

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The distance between Earth and the Moon was determined by measuring the time it took for light waves from Earth to travel to the Moon and back. Why was it not possible to use sound waves for this experiment?
  1. Sound waves must move through a substance.
  2. Sound waves would change frequency on the return to Earth.
  3. Sound waves move too slowly for the technique to be accurate.
  4. Sound waves move more slowly in Earth’s atmosphere than in space.
Explanation
Answer: A - Sound waves must move through a substance.
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