The best evidence for quarks comes from
A. the decay of electrons into quarks and mesons.
B. scattering experiments performed at very high energies.
C. theories that would not make sense if quarks did not exist.
D. particles seen outside the nucleus with charge 1/3 the charge of a proton.
Answer: B
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Star A has an apparent visual magnitude of 13.4 and star B has an apparent visual magnitude of 15.4 . Star A is ____ than star B
a. 2 times fainter b. 2 times brighter c. 6.3 times fainter d. 6.3 times brighter e. 29.8 times fainter
If an all-electric car has kinetic energy, then it also must have
A) impulse. B) momentum. C) acceleration. D) force. E) none of the above
How are asteroid masses measured?
What will be an ideal response?
The magnetic pole near the Earth's north geographic pole actually has to be
A. either an N or an S pole, but scientists have not determined which one yet. B. an S pole, because it attracts the N pole of your compass needle. C. an N pole because it repels the S pole of your compass needle.