Fact 1: Aradio converts electrical energy into vibrations.

Fact 2: All radio is transmitted electrical energy.

Given the two facts above, answer the question "electrical energy is transmitted into what for sound?" with the following options: 
- vibrations
 - motion
 - heat
 - sensory neurons
 - waves
 - light
 - Firecrackers
 - cold


 

 vibrations        