Fact 1: Hitting an object causes the particles in that object to vibrate.

Fact 2: Electrical particles in materials vibrate and accelerate.

Given the two facts above, answer the question "What moves electrical particles in an object ?" with the following options: 
- hitting
 - waves
 - beating
 - wind
 - messengers
 - a doorbell
 - heat
 - tapping


 

 hitting        