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AP Physics B Practice Exam

Category - Introductory Physics

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A window washer noticed that, from the same distance and with no breeze, the smell of ammonia glass cleaner reached him faster on a hot day (30°C) than on a cold day (5°C). Which of the following explains this observation?
  1. Molecules expand at higher temperatures.
  2. Molecules move more rapidly at higher temperatures.
  3. The convection currents carry molecules at higher temperatures.
  4. The chemical reaction of molecules increases at higher temperatures.
Explanation
Answer: B - Molecules move more rapidly at higher temperatures.
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