Fact 1: Blowing air into a whistle causes air to vibrate inside the whistle.

Fact 2: Soon the wind blows in fresh air.

Given the two facts above, answer the question "What would wind going through a whistle cause?" with the following options: 
- vortex
 - friction
 - vibrant colors
 - waves
 - Energy.
 - kinetic energy
 - absence of sound
 - vibrations


 

        vibrations 