In broken pen phenomenon the reason of this phenomenon is the changing in the it passes from to

This is the number of complete movements of a wave per second.

The sound level near a noisy air conditioner is 70 db. if two such units operate side by side, the sound level near the, would bea. 70dbb. 73 dbc. 105 dbd 140 db

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero