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AP Physics B Practice Exam

Category - Introductory Physics

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Electromagnetic waves of various frequencies reach Earth from distant parts of the universe. Which of the following can be inferred from this?
  1. The wavelengths must be very short.
  2. A single material must fill all of space.
  3. These waves can travel without a medium.
  4. The speed of these waves is 300,000,000 m/s.
Explanation
Answer: C - These waves can travel without a medium.
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