The electrons are quantized in an atom. That means
A. the electrons are in bulk.
B. the quantity of electrons keeps changing.
C. the electrons can stay only in specific orbits.
D. All of these choices are correct.
Answer: C
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Globular clusters are primarily found in the ____________________ component of the Galaxy
Fill in the blank(s) with correct word
Ice has been discovered at Mercury's poles. How can it survive, given the planet's dayside temperature?
A. Parts of Mercury's poles are in permanent shadow. B. Mercury has an elliptical orbit that carries it far from the Sun. C. Mercury rotates such that one side of the planet always faces the Sun. D. Mercury's small size let the planet cool quickly.
If a person in Alaska were locked out of his house on a day when the temperature outside was -40°C, his thick clothing would mostly reduce the loss of thermal energy by
a. conduction. b. convection. c. radiation. d. all of the above. e. convection and radiation.
All places on Earth would have high tides at the same instant if the
A) Moon did not revolve. B) Moon did not rotate. C) Sun did not revolve. D) Sun did not rotate. E) none of the above