Color

This is a picture of a plant. The flowers and the leaves show physics. The physics of color and light. Light that shines from the sun is white light made up of red, green, and blue. When a object looks a certain color it is because one or more of the parts of light are being either reflected or absorbed. In the flowers, the petals are white which mean that all the colors of light are being reflected. The inner part of the flower is yellow which means that blue is being absorded while green and red are being reflected which creates the yellow which you see. The leaves and stems which are green are formed by the absorbtion of red and blue while only green is reflected which is the color you see. In the bottom right corner of the picture you can see a little bit of a purple flower from a different plant. Purple is a combination created from the absorption of green and the absorption of green. The blue and red reflected will create magenta ideally but if more blue is reflected then the color perceived will be purple.

The Doppler Effect

I know this post is really late but here it goes anyway. This is a picture of my car steering wheel. From this wheel comes the power to blast a very loud car horn. This horn involves the Doppler Effect. The Doppler Effect involves the "perceived" change that a listener observes in frequency and wave length. As the object producing the sound (car horn) is moving toward the listener, the waves of sound increase in frequency as the waves are compressed with shorter wavelengths which gives the impression of a higher pitch horn. As the horn moves away from the listener the sound becomes a lower pitch as the waves emitted from behind the source have a lower frequency and longer wavelengths. This is the Doppler Effect.