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Q: What is the frequency of ultrasonic waves?
  • A. 20 Hertz to 20 kHertz
  • B. Less than 20 Hertz
  • C. More than 20 k Hertz
  • D. No bandwidth defined
Correct Answer: Option C - Ultrasonic waves are waves above 20000Hertz frequency. Human ears cannot hear this but can hear from some animals like dogs, cats, bats etc. Use of ultrasonic waves are– 1- Signal sending 2- Detecting the depth of the sea 3- Cleaning the components of precious clothes, airplanes and watches 4- In destroying harmful bacteria from inside the milk 5- Treatment of arthritis and detection of brain tumors
C. Ultrasonic waves are waves above 20000Hertz frequency. Human ears cannot hear this but can hear from some animals like dogs, cats, bats etc. Use of ultrasonic waves are– 1- Signal sending 2- Detecting the depth of the sea 3- Cleaning the components of precious clothes, airplanes and watches 4- In destroying harmful bacteria from inside the milk 5- Treatment of arthritis and detection of brain tumors

Explanations:

Ultrasonic waves are waves above 20000Hertz frequency. Human ears cannot hear this but can hear from some animals like dogs, cats, bats etc. Use of ultrasonic waves are– 1- Signal sending 2- Detecting the depth of the sea 3- Cleaning the components of precious clothes, airplanes and watches 4- In destroying harmful bacteria from inside the milk 5- Treatment of arthritis and detection of brain tumors