By how many decibels does the intensity level of a sound decrease when you triple your distance from a source of sound?
A) 12 dB B) 6.0 dB C) 4.8 dB D) 3.0 dB E) 9.5 dB
E
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Pure water is classified as
A. an insulator. B. a conductor. C. a semiconductor. D. all of these choices are correct E. none of these choices are correct
In the mnemonic, My Very Educated Mother Just Served Us Noodles, _________ refers to Mars
Fill in the blank(s) with correct word
Sunspots often appear in pairs
a. True b. False Indicate whether the statement is true or false
Suppose we compare the combined mass of a C atom and an O2 molecule, both at rest, with the mass of a CO2 molecule, also at rest. According to Einstein's theory, the combined mass of the C and O2 is
A) slightly less, by an amount so small that it hard to measure, than the CO2 molecule's mass. B) precisely equal to the CO2 molecule's mass. C) considerably more than the CO2 molecule's mass. D) considerably less than CO2 molecule's mass. E) slightly more, by an amount so small that it hard to measure, than the CO2 molecule's mass.