Lasers are used
a. to produce holograms.
b. in surgery.
c. to measure distances between objects accurately.
d. in DVD and compact disc players.
e. all of the above
e
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Which form of electromagnetic radiation is absorbed by carbon dioxide and water vapor in our atmosphere?
A) visible light B) ultraviolet C) infrared D) radio E) gamma rays
Considering Einstein's famous equation, E = mc2, which of the following statements is true?
A) Mass can be turned into energy, but energy cannot be turned back into mass. B) It takes a large amount of mass to produce a small amount of energy. C) A small amount of mass can be turned into a large amount of energy. D) You can make mass into energy if you can accelerate the mass to the speed of light. E) One kilogram of mass represents 1 joule of energy.
Evaporation from the oceans produces clouds that precipitate fresh water rather than saltwater because
A) salt is too heavy to evaporate. B) evaporation produces nearly pure water vapor. C) dissolved salt prevents evaporation. D) saltwater precipitates over oceans only.
In which type of collision is no kinetic energy lost?
A. A perfectly elastic collision B. A perfectly inelastic collision C. A partially inelastic collision D. Energy is always conserved