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The term supersonic is used for ____________.

  1. speed more than speed of sound
  2. frequency of sound wave more than 20KHz
  3. speed of sound less than 20Hz
  4. speed of rocket in space

Answer (Detailed Solution Below)

Option 1 : speed more than speed of sound
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Detailed Solution

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CONCEPT:

  • Supersonic: The speed of an object more than the speed of the sound (1 Mach).
  • Infrasonic sound has a frequency less than 20Hz or less than the audible frequency range.
  • Ultrasonic Sound has a frequency of more than 20000 Hz.
    • It has a frequency above the upper limit of human hearing or greater than the audible frequency range.

EXPLANATION:

  • Option 1: speed more than the speed of sound
    • An object's speed more than the speed of sound is called supersonic speed.
  • Option 2: frequency of sound wave more than 20KHz
    • This range of frequency is called ultrasonic sound.
  • Option 3: speed of sound less than 20Hz
    • This range is known as infrasonic sound.
  • Option 4: speed of rocket in space
    • It has no specific term.
  • So the correct answer is option 1.
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