You are presented with the question "a firecracker converts chemical energy into what?" and the following answer choices: 
- kinetic energy
 - Loud noises
 - vibrating waves
 - An object is seen
 - electromagnetic energy
 - deoxyribonucleic acid
 - hydrogen and oxygen
 - harmful substances

Now knowing that afirecracker converts chemical energy into sound and sound waves vibrate, choose the best answer.


 

   vibrating waves      