Question

Two sound waves of equal amplitude interference so that compression of one wave falls on the rarefaction of the other. Which statement is true?

A. No sound is heard

B. The loudness of the sound increase

C. There is no change in the sound

D. The pitch of the sound increases

Answer 1

A. No sound is heard 
A*sin(wt)+(-A)*sin(wt)=0 - no sound

Answer 2

Answer:

the answer is.............................................................................................................................................................................................................................................................................................................................................................A

Explanation: