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Galaxies emit

A. radio waves and X-rays

B. ultraviolet light waves

C. visible light waves

D. All the above

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  3. The audible range of a normal human ear is frequencies ranging from
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  5. Which of the following rays has the highest penetrative power?
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  17. A person does not sink in the Dead Sea because
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  19. The electron has a mass equal to
  20. Two tumblers stuck together can be separated by
  21. Expansion of a rod when heated
  22. A convex mirror always produces
  23. The planet that is known as earth's twin is
  24. Which physical quantity is measured in watts
  25. The following are the atmospheric zones above the surface of the earth:A) Troposphere B) IonosphereC)…
  26. A light year means
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