Question

ਜ਼ਜੀਆ ਕੀ ਸੀ? जनजा कैसी ​

Answer 1

Answer:

Ultrasonic wave is defined as “inaudible sound with high frequency for human” the frequency of which generally exceeds 20 kHz. These days, sound wave which is not intended to be heard is also called ultrasonic wave.