When the distance between two stars decreases by one-third, the force between them
A) decreases by one-third.
B) decreases by one-half.
C) increases to twice as much.
D) increases to nine times as much.
E) none of the above
Answer: D
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A neutron makes a better "nuclear bullet", for fissioning a nucleus, than does a proton. This is because
A) it is easy to accelerate neutrons to high speeds in nuclear accelerators. B) the negative charge on the neutron attracts it to the nucleus. C) protons do not feel the strong nuclear force and thus do not interact appreciably with the nucleus. D) neutrons are so much more massive than protons. E) unlike the proton, the neutron is not repelled by the charge on the nucleus.
A photocathode has a work function of 2.4 eV. The photocathode is illuminated with monochromatic radiation whose photon energy is 3.5 eV. The wavelength of the illuminating radiation is closest to:
A) 350 nm B) 330 nm C) 300 nm D) 380 nm E) 410 nm
Perturbations of planets are due to
A) interplanetary forces. B) deviations from straight-line paths. C) uneven masses of planets. D) none of the above
The radiocarbon content of 14C decreases after the death of a living system with a half-life of 5730 y. If an archaeologist working a dig finds an ancient firepit containing some partially consumed firewood and the wood contains only 12.5 percent of the 14C content of an equal carbon sample from a present-day tree, what is the age of the ancient site?