Which one of the following statements with regard to ultrasonic waves

Which one of the following statements with regard to ultrasonic waves is NOT correct?

Ultrasonic waves have frequency above 20 kHz

Ultrasonic waves are longitudinal waves

Ultrasonic waves can travel through water

Ultrasonic waves can travel through vacuum

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC Geoscientist – 2021

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Ultrasonic waves are sound waves with frequencies above the upper audible limit of human hearing (typically above 20 kHz). Like all sound waves, they are mechanical waves, meaning they require a material medium (solid, liquid, or gas) to propagate. They cannot travel through a vacuum.

Mechanical waves transport energy through the vibration of particles in a medium. In a vacuum, there are essentially no particles to vibrate, so mechanical waves cannot propagate.

Ultrasonic waves are longitudinal waves, meaning the particle displacement is parallel to the direction of wave propagation, similar to how sound travels in air. They are used in various applications, including medical imaging (ultrasound), sonar, and industrial cleaning.

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