1. It cannot be transmitted over larger distances with no appreciable loss of energy
  2. Produce intense heating effect when passed through a substance
  3. Velocity not remains constant in homogeneous media
  4. The ultrasonic waves can travel through vacuum
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1 Answers

Option 2 : Produce intense heating effect when passed through a substance

CONCEPT:

  • Sound waves are longitudinal mechanical waves and frequency can be defined as the number of wave cycle happening in one sec.
    • Ultrasonic waves or Ultrasound waves: The sound frequency above 20,000Hz (upper audible limit of human hearing) is known as ultrasonic waves. Humans cannot detect it too.
    • Examples: Bat produce Ultrasonic waves.

EXPLANATION:

  • Ultrasonic waves are transmitted in a medium over a longer distance with no appreciable loss of energy, but it cannot propagate in vacuum.
  • The velocity remains constant in homogeneous medium.
  • If it is passing through a substance then it produces a heating effect. So option 2 is correct.
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