Which is true of all percussion instrument sounds?
a. They include sounds from metallic bells, triangles, and cymbals, but not drums.
b. The higher frequencies that contribute are not whole-number multiples of the lowest frequency.
c. The higher frequencies that contribute are always whole-number multiples of the lowest frequency.
d. The frequencies that contribute can be, but do not have to be, whole-number multiples of the lowest frequency.
e. They are all structured the same way that string and wind instrument sounds are structured.
b
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When the huge polar caps on Mars form every winter, they are made chiefly of ________
Fill in the blank(s) with correct word
Lead (a solid) may be changed into mercury (a liquid) by
A. grinding the lead to dust and then melting the dust. B. heating the lead to extremely high temperatures. C. dissolving the lead in acid so that it loses enough mass to have the same mass as mercury. D. None of these choices are correct
Electric current is measured in which SI units?
a) watts. b) joules. c) amperes. d) coulombs.
How did seafloor spreading suggest a driving force for continental drift?
A) Youngest seafloor is found near continents. B) Seafloor spreading pushes continents. C) Mantle convection causes irreversible slippage. D) Subduction creates the youngest seafloor.