What is supersonic speed?
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Supersonic travel is a rate of travel of an object that exceeds the speed of sound. For objects traveling in dry air of a temperature of 20 °C at sea level, this speed is approximately 343.2 m/s. Speeds greater than five times the speed of sound are often referred to as hypersonic.
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The sound which is above than 20,000hz is called supersonic sound and it is not audible by human beings.
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