What does the technique of interferometry allow?
A) It allows two or more telescopes to obtain a total light-collecting area much larger than the total light-collecting area of the individual telescopes.
B) It allows two or more telescopes to obtain the angular resolution of a single telescope much larger than any of the individual telescopes.
C) It allows us to determine the chemical composition of stars.
D) It allows astronomers to make astronomical observations without interference from light pollution.
E) It allows the same telescope to make images with both radio waves and visible light.
B
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Given the average refrigerator lifetime of 19 years, would you save money or spend money overall by 2006 if you bought the efficient model for $500? Suppose you know that the best refrigerator available in 2006 when the old one really bites the dust will use 380 kWh/yr. Should that affect your decision to buy now? Explain.