Although neutron stars are very hot, they are faint and not easy to see at visual wavelengths because
a. light does not escape from their event horizon.
b. most lie beyond dense dust clouds.
c. they have only a small surface area from which to emit.
d. the peak of their thermal emission is at much shorter wavelengths than visual
e. both c and d
E
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The region around Earth where the magnetic field traps charged particles is the
A) ozone layer. B) exosphere. C) Van Allen Radiation Belts. D) corona. E) aurora borealis and australis.
14C has a half-life of 6000 years. An ancient corpse is uncovered and found to have 1/32--one thirty-second--of the normal amount of 14C found in the bodies of people now living. How long has the body been dead?
A) 24,000 years B) 6000 years C) 12,000 years D) 30,000 years E) 36,000 years
A concave mirror with a radius of curvature of 1.0 m is illuminated by a candle located on the symmetry axis 3.0 m from the mirror. Where is the image of the candle?
Why do vapor bubbles get larger in boiling water as they approach the surface?
a. They only appear to get larger, this being a magnification effect due to looking through the water. b. The bubbles' pressure increases as they rise. c. The pressure in the water decreases as the bubble moves toward the surface. d. Bubbles always get bigger after they form.