The purpose of prescription glasses for a near-sighted person is to bring the apparent positions of distant objects
a. to the far point of the eye
b. to the near point of the eye
c. to the retina of the eye
d. none of the above
A
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Why is the possible contamination of the Earth by Martian microbes in a future sample return mission not considered to be a significant problem?
A) Martian microbes will certainly be destroyed by terrestrial microbes B) any Martian microbes will be destroyed by high-energy particles and radiation on their trip back to Earth C) Martian microbes will be rapidly destroyed by oxygen in the Earth's atmosphere D) Martian microbes are likely to be quite different than terrestrial microbes and, hence, will probably not be able to affect life on Earth
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.If two slide projectors are connected in series across the same 120-volt source, the current drawn from the source is __________
Fill in the blank(s) with correct word
When light in material 1, which is in contact with material 2, undergoes total internal reflection, what condition is necessary for their indices of refraction?
A. n1 = 2 n2 B. n1 > n2 C. n1 < n2 D. n1 = n2+ 1 E. n2 = 1.5
Carbon-14 Dating: The radioactivity due to carbon-14 measured in a piece of a wooden casket from an ancient burial site is found to produce 20 counts per minute from a given sample, whereas the same amount of carbon from a piece of living wood produces 160 counts per minute. The half-life of carbon-14, a beta-minus emitter, is 5730 years. What would we calculate for the age of the artifact, assuming that the activity for living wood has remained constant over time?
A. 5700 years B. 11,500 years C. 14,800 years D. 17,200 years E. 23,000 years