Define supersonic sound
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Supersonic travel is a rate of travel of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately 344 m/s, 1,125 ft/s, 768 mph, 667 knots, or 1,235 km/h.
Human are not able to hear this sound.
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sound whose frequency is more than 20000 hz is called ultrasonic sound. We cannot hear these sounds. some animals like owl produces ultrasonic sound.
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