"Ultrasound and Infrasound" 0.0 / 5 ? PhysicsWaves and SoundGCSEEdexcel Created by: GoCreated on: 25-10-13 15:03 Ultrasound is sound with frequencies higher than... 20 000 Hz 1 of 6 Ultrasound is useful in lots of different ways such as... Pre-natal scanning of a foetus and sonar (detecting stuff in the water). 2 of 6 Infrasound is sound with frequencies less than... 20 Hz 3 of 6 Sound that has a frequency below the range of human hearing (i.e. below 20 Hz) is called... Infrasound 4 of 6 _____ waves can be used to work out distances. Ultrasound 5 of 6 Speed (m/s) = Distance (m) ÷ _____ (s) Time (s) 6 of 6
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