Is it true that you can mix common, household chemicals with a popular carbonated soda to make it glow in the dark?
Sorry, but this content is reserved for subscribers only.
Why do I charge for this site?
This is how I earn a living. Your subscription helps me pay for production costs, web hosting, bandwidth charges, etc.
While other sites generate money by making you watch ads before each video, putting ads on every page, or constantly trying to sell you things, those are the things that annoy me when I visit a website. I find that many parents and teachers prefer an educational site with no ads or sales pitches, even if it means paying a small fee to help cover costs.
Even better, Subscribe Now, and get full access to hundreds of videos and other science resources. The $29.95/year subscription helps cover the costs of producing new videos, writing curriculum units, site development, and hosting. Without that support, this site would not be possible.
If you are already a subscriber, and having problems logging in, please check the Help Page.
Oil on water makes lots of pretty colors. What does it tell us about the nature of light?
The colors are evidence that light energy travels as waves. Some of the light reflects from the surface of the oil. When the light passes from the oil to the water, more of it is reflected. The two reflections are slightly out of sync, since one travels slightly farther than the other.
Because light acts as waves, if two waves of the same color meet when they are in sync, the color will be brighter. If two waves of the same color meet when they are not in sync, the color will be dimmer or totally absent.
While these colors indicate that light acts as a wave, there are other experiments which show that light acts as a particle. Now we talk about light being made up of photons, which can act as either a wave or a particle.