Water freezes at atmospheric pressure and a temperature of

A) 0 degrees Celsius.
B) 32 degrees Fahrenheit.
C) about 273 kelvin.
D) all of the above
E) none of the above

Answer: D

Physics & Space Science

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Intensity: For an electromagnetic wave in free space having an electric field of amplitude E and a magnetic field of amplitude B, the ratio of B/E is equal to

A. c.
B. c2.
C. 1/c.
D. 1/c2.
E. .

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The Valles Marineris is ________ on the surface of Mars.

A. a long scarp B. a large volcano C. a 4,000-km canyon D. an old riverbed

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The heaviest element produced by stars or in supernovae is silicon

Indicate whether the statement is true or false

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Which of the following statements is true about fission reactions?

a. The fission products themselves are often unstable. b. Spontaneous fission occurs when low energy neutrons collide with an unstable nucleus. c. The nuclear strong force is most fundamentally responsible for forcing apart the nucleus during fission. d. Fission reactions are just as efficient at producing energy as fusion reactions. e. Binding energy per nucleon is greater for nuclei with Z >200 than for smaller nuclei, so heavier elements are less efficient in producing energy through fission reactions.

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