Practice Quiz

Praxis II General Science

Category - Physics

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Which of the following statements concerning radiation is not true?
  1. Humans emit infrared radiation.
  2. All objects to some extent emit a form of radiation.
  3. Radiation entering the earth’s atmosphere includes ultraviolet, gamma, and electromagnetic radiation.
  4. Many types of radiation are harmful to humans.
  5. All of the above statements are true.
Explanation
Answer: C - Radiation entering the earth’s atmosphere includes light, ultraviolet, infrared, and electromagnetic radiation, but not gamma radiation. If gamma radiation struck earth on a large scale, most life would be wiped out.
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