4. How is sound transmitted and heard? A. When energy from the movement of particles was absorbed B. When energy travels as visible light C. The vibrations of bodies cause the air molecules to vibrate. D. None of the above
5. which is true about loudspeakers
a. it can convert electrical energy to sound energy
b. electrical energy can complete with sound energy
c. it can change the sound energy into electrical energy
d. it can only be used for music output​