Direction: Put a check (/) on the materials that undergo light energy and cross (x) if they are not.
1.Turning on the salt lamb
2.clicking on television
3.hitting the cymbals
4.turning on the lampshade
5.plucking of the electric guitar
6.Blowing trumpet
7.turning on electric fan
8.playing on your phone
9.watching on your computer
10.waving a light stick.