The only way to make sound travel faster in air is to change the air's ____________.
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Q130: A test tone used on a radio
Q131: Match each item with the correct statement
Q132: A huge explosion is heard 20 miles
Q133: Two uses of ultrasound are _ and
Q134: Match each item with the correct statement
Q136: Match each item with the correct statement
Q137: Match each item with the correct statement
Q138: The wavelength of ultrasound at 1 million
Q139: In the upper atmosphere at altitudes where
Q140: A sound level of 80 dB has
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