What is the frequency range of the ultrasonic sound waves used by the ultrasonic sensors?

What is the frequency range of the ultrasonic sound waves used by the ultrasonic sensors? Correct Answer 25KHz to 50KHz

The Ultrasonic Sensors produces sound waves of frequency in the range of 25KHz to 50KHz. These Ultrasonic sounds produced by the sensors transmitter bounce back the in the same path when it encounters an object in its path. The receiver part receives these waves and calculates the distance and displacement accordingly.

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The figure given below shows the function of ultrasonic waves. What are these techniques called?
Sounds waves and Motion mcq question image