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Ultrasonic waves are those sound waves having frequency

Ultrasonic waves are those sound waves having frequency Correct Answer More than 20 Kilohertz

CONCEPT:

  • Sound waves are longitudinal mechanical waves and frequency can be defined as the number of wave cycle happening in one sec.
  • Sound waves can be divided into three categories based on their frequency range:

Audible sound waves:

  • The frequency range of this wave is 20 Hz – 20000 Hz. Humans can easily detect these types of waves.
  • Example: Sound produced by Vocal cords.

Infrasonic waves:

  • The frequency range of these type of wave is below 20 Hz. Humans cannot detect it.
  • Example: Sound produced by Earthquake, Volcanic eruption and ocean waves etc.

Ultrasonic waves:

  • The sound frequency above 20,000 Hz is known as ultrasonic waves. Humans cannot detect it too.
  • Examples: dog whistle.

EXPLANATION:

  • As the ultrasonic wave has frequency more than 20000 hertz (20 Kilohertz). So option 3 is correct.

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