The element gold contains
A) gold atoms.
B) atoms that combine to produce gold.
C) gold atoms plus various slightly lighter and heavier atoms.
D) none of the above
Answer: A
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A bound quark-antiquark pair is a ________ while a bound quark triplet is a ________.
A. beta particle; proton B. neutron; meson C. meson; baryon D. baryon; meson E. neutrino; antineutrino
Dark matter has not been observed at any electromagnetic wavelength
Indicate whether the statement is true or false
A 2 500-kg car moving north collides with a 2 000-kg car moving west. After the collision, the cars stick together and move at an angle of 45° north of west at a speed of 8.0 m/s. What was the initial speed of the 2 500-kg car?
a. 20 m/s b. 10.2 m/s c. 14 m/s d. 9.3 m/s
The darkness of clouds is due to
A) absorption. B) often being in the shadow of another cloud. C) both of these D) neither of these