نور   

What's the fastest thing in the universe? If you said light, you're right! It takes us about 6 hours to fly from New York to California. Light can go there — and back — in 1/30 of a second!


There's more to light than meets the eye!
It is a special kind of energy, called electromagnetic radiation, and it travels in waves.

 

Visible light waves come in different sizes: short ones look blue and long ones look red. All other electromagnetic radiation is invisible to our eyes — like the very long waves that can carry signals to radios.

Whatever the size, you won't find anything that goes faster than light. Why not? That's a light mystery that's kept scientists in the dark — so far.

لینک
سه‌شنبه ۱٠ مهر ۱۳۸٦ - ویدا وحیدنیا