If the intensity level at distance d of one trombone is 70 dB, what is the intensity level of 76 identical trombones, all at distance d?
A) 146 dB
B) 89 dB
C) 5320 dB
D) 76 dB
E) 82 dB
B
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Quasars are caused by galaxy collisions in the early Universe
a. True b. False Indicate whether the statement is true or false
A metal block has a mass of 5 grams and a volume of 1 cubic centimeter. A piece of the same kind of metal with a volume of 2 cubic centimeters has a density of
A) 2.5 g/cm3. B) 5 g/cm3. C) 10 g/cm3.
In the context of blackbody radiation, which of the following statements is true of stars?
A) Temperatures of stars cannot be estimated from their color. B) Red stars are cool, and blue stars are hot. C) Red stars are hot, and blue stars are cool. D) Star temperatures cannot be measured using the relative strengths of various spectral lines.
The oldest known elements in the periodic table are the ones with
A) the lowest atomic numbers. B) the highest atomic numbers. C) odd looking atomic symbols. D) atomic symbols that match their modern names.