This gives them their color. However,when light travels from air to snow, some light is sent back,or reflected.

VOA: special.2010.01.05

Then it was put on overland company stage coaches light wagons pulled by four or six horses.

VOA: special.2009.05.28

The Doppler effect explains changes in the length of light waves or sound waves as they move toward you or away from you.

VOA: special.2009.04.29

The light absorbed,or collected, by an asbestos surface can be recognized by an appearance all its own.

VOA: special.2009.11.17

At the same time he heard, or imagined he heard,a light, soft step and then another.

VOA: special.2009.10.31

The blue light is the product of a long travel path through the snow or ice.

VOA: special.2010.01.05

And the team says changes in time spent in light or dark environments influences eating habits.

VOA: special.2010.12.21

When a light particle,or photon, hits an electron, the electron jumps to a higher energy state.

VOA: special.2010.09.01

Mister Kao discovered how to transmit,or send,light signals over long distances through optical glass fibers.

VOA: special.2009.12.08

Among the products were TVs that use light emitting diodes, or LEDs,to save energy.

VOA: special.2010.01.26

If it is a meter or more thick, however,blue light often can be seen.

VOA: special.2010.01.05

For example, most people wear light-colored clothing such as light brown or tan.

VOA: special.2009.08.19

People with light-colored skin, hair or eyes are at greatest risk.

VOA: special.2010.07.06

So can the light that the surface reflects, or reproduces.

VOA: special.2009.11.17