Question

The speed of highly penetrating ultrasonic waves is:

• A. lower than those of audible sound waves.
• B. higher than those of audible sound waves.
• C. much higher than those of audible sound waves.
• D. same as those of audible sound waves.

Answer 1

The correct option is D same as those of audible sound waves.

Speed of highly penetrating ultrasonic waves is greater than 20,000 Hz are known as ultrasonic waves or ultrasound. The frequency of ultrasonic waves is greater than 20,000 Hz and equal to 10${}^7$ Hz.