Which makes up the mobile phase used in gas chromatography
a. liquid nitrogen
b. silica gel
c. filter paper
d. a gas

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Which statement best describes how the loudness of the sound affects the high-pressure region created by the sound wave? a. a louder sound has no effect on the pressure created. b. a louder sound means a high-pressure region that is higher. c. a louder sound means a high-pressure region that is not as high.