. What are ultrasonic waves


A: Sound waves having frequency shorter than audio frequency range

B: Sound waves produced in a vaccum

C: Sound waves having frequency higher than audio - frequency range

D: None of these

 

Best Answer

Explanation:

The audible frequency range for the human ear is 20Hz to 20000Hz; sound waves over 20000Hz are ultrasonic, while sound waves below 20Hz are infrasonic. 

Ultrasonic waves are defined as sound waves with a frequency greater than the audio frequency range (20.000Hz).

Final answer:

Hence, option C is correct, i.e., Sound waves having frequency higher than audio - frequency range.

 

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