The Hubble time only describes a Universe that is ____
a. flat
b. totally open
c. totally closed
d. partially open
e. partially closed
b
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How many times smaller are the tiniest particles that we know about than the size of the Earth?
A. about 1025 times smaller B. about 10 times smaller C. about 1000 times smaller D. about 100 million times smaller E. about 1 million times smaller
What is the approximate nuclear radius of an isotope of sodium with 11 protons and 12 neutrons?
What will be an ideal response?
One piece of evidence that Democritus found for his idea that everything is made of atoms was
A) the smell of bread and of other substances. B) the random, chaotic motions often found in liquids. C) the fact that chemicals combine in definite proportions. D) Brownian motion. E) the twinkling of stars, due to our atmosphere.
Two instruments produce a beat frequency of 5 Hz. If one has a frequency of 264 Hz, what could be the frequency of the other instrument?
a. 269 Hz b. 254 Hz c. 264 Hz d. 5 Hz e. 274 Hz