Sound

Kyler and I were reading 'Light and Sound' by Eve Hartman and Wendy Meshbesher. 

We talked about how sound and light travel on waves and what makes sound waves.

Me: "When you pluck a guitar string, what make the sound wave?"
Kyler: "VVvvvvvvibration"
Me:"Why do the strings all make different sounds, do you think?"
Kyler: "They are different sizes and make different vvvvvibrations."
Me:"VERY good.  What travels faster...light or sound?"
Kyler: "Light."