What time of year is it dark all day (and night) at the South pole?

a) never
b) June
c) December
d) September
e) March


Ans: b) June

Physics & Space Science

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The number of protons in a neutral atom is balanced by an equal number of

A) electron shells that surround the nucleus. B) neutrons in the nucleus. C) orbital electrons. D) none of the above

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There is very little interstellar gas or dust in most elliptical galaxies

Indicate whether the statement is true or false

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If a body were in orbit very near the surface of the Earth, its centripetal acceleration would be

a. equal to g. b. smaller than g. c. larger than g. d. dependent on its mass. e. none of the above.

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The potential energy of an electron in the ground state of the hydrogen atom is _________.

A. 0.000 B. -13.6 eV C. -27.2 eV D. 13.6 eV E. 27.2 eV

Physics & Space Science