All stars produce an absorption spectra
a. True
b. False
Indicate whether the statement is true or false
True
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In the distant past, the temperature of the universe was
A) hotter than it is today. B) cooler than it is today. C) absolute zero (0 K). D) 3 K.
Which of the following best describes the findings of the Viking landers in the experiments they conducted to search for life on Mars?
A) Some experiments were potentially suggestive of life, but their results could also be explained by chemical reactions not associated with life. B) Absolutely no evidence indicating life was found in the Martian soil. C) The landers detected organic material and evidence for microbial organisms in the soil. D) The experiments failed to operate properly and therefore did not provide any results.
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.
A pressure of 1012 mb is indicated on a weather map. Is this pressure high or low? Explain