Ultrasound is sound or other vibrations having an ultrasonic frequency, particularly as used in medical imaging. Also, Infrasound is sound waves with frequencies below the lower limit of human audibility.
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The formula is wavelength=speed÷frequency so if you do 15÷9 which equals 1.6
The pressure law states that for a constant volume of gas in a sealed container the temperature of the gas is directly proportional to its pressure.