Whereas electric charges can be isolated, magnetic poles
A) can also.
B) cannot.
C) gather in clusters.
D) none of the above
Answer: B
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Exoplanetary systems containing "hot Jupiters"—extremely massive planets orbiting very close to their parent stars—do not look like our own solar system. Are they inconsistent with the condensation theory of solar system formation? Explain
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Why is the temperature at the region of a sunspot cooler than the photosphere?
a. They are holes in the photosphere that reveal the lower temperature gases in the deeper layers. b. They represent points where streams of cool gas from the corona lower the temperature in those regions of the photosphere c. Powerful magnetic fields in the sunspots act upon the atoms of the photosphere to prevent them from emitting light. d. Powerful magnetic fields inhibit the convective flow of the gases of the photosphere downward allowing them to cool for longer than would normally be permitted.
In tropical areas of the world where refrigeration is not readily available, people store water in unglazed clay pots. This makes the water stay at a cool temperature, much cooler than the ambient temperature. How is that possible?
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Tritium has a half-life of 12.3 years. How many years will elapse when the radioactivity of a tritium sample diminishes to 35% of its original value?
a. 1.2E–1 years b. 1.9E+1 years c. 4.3E+0 years d. 6.3E+1 years e. 8.1E+0 years