If Planck's constant were ten times smaller than it is, quantum effects would be
A) easier to detect.
B) more difficult to detect.
C) neither easier nor more difficult to detect.
B
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Oscillations in the early universe are most similar to:
A) water waves. B) sound waves. C) light waves. D) seismic waves. E) oscillations of stars in the instability strip of the H-R diagram.
Which has a larger mass, a liter of water or a liter of mercury (a liquid metal)?
a. mercury b. water c. none of these
Fission fragments are
A. harmless particles emitted in radioactivity B. among the most dangerous kind of radiation C. ghost-like particles that pass through the Earth D. the source of most energy in the Sun
With an optically perfect 200-power telescope with a 1.5-inch-diameter tube, you can resolve objects roughly how many times closer together than you could with your naked eye? (Choose the closest answer.)
A. 200 times B. 100 times C. 20 times D. 5 times E. No better at all