Question

.Which of the following statement is or are correct about longitudinal mechanical waves?
(1 Point)
A. The longitudinal mechanical waves which lie in the frequency range 20 Hz to 20000 Hz are called audible or sound waves.
B. The longitudinal mechanical waves having frequencies less than 20 Hz are called infrasonic.
C. The longitudinal mechanical waves having frequencies greater than 20,000 Hz are called ultrasonic waves.
D. All of the above are correct​

Answer 1

ya sab aata tha but bhul gya apka Profile dekh ke......!!

Answer 2

Answer:

Sayad ap bhi bhul gye kya mujhe ....

so sad yrr