Of the four known fundamental forces, the one that holds electrons into their orbits in atoms is
A) the strong nuclear force.
B) gravitational.
C) centrifugal.
D) electromagnetic.
E) Nonsense--these electrons have no forces acting on them.
D
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The change in shape due to transport of atoms through the bulk of the material is called _________ creep.
Fill in the blank(s) with the appropriate word(s).
Suppose the date is March 21 and the Sun crosses your meridian at an altitude of 23-1/2° in the north. Where are you?
A) the equator B) the Tropic of Cancer (latitude 23-1/2°N) C) the Tropic of Capricorn (latitude 23-1/2°S) D) the Arctic Circle (latitude 66-1/2°N) E) the Antarctic Circle (latitude 66-1/2°S)
An electron in the hydrogen atom has a wavelength of 2.67 nm. To what state of the hydrogen atom does this electron belong?
A) n = 2 B) n = 5 C) n = 8 D) n = 11 E) n = 14
Clouds that develop about 1000 meters above the ground are generally
A) cirrus and cirrocumulus type clouds. B) cumulus and stratus type clouds. C) cumulus and cirrocumulus type clouds. D) cirrocumulus and altocumulus type clouds.