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

Fact 2: Geoffrey stops to hit a gong in different places, testing the concept of resonance.

Given the two facts above, answer the question "What does gong's particles vibrating cause?" with the following options: 
- particle explosion
 - friction
 - silence
 - ice forming
 - heat energy
 - Energy.
 - energy
 - resonance


 

        resonance 