Light

Bücher

Angebote / Angebote:

Did you know that light is an amazing form of energy? The speed of light is so fast that nothing can slow it down, including the human body! The study of light is called photonics. It teaches kids about the nature of light and how we can make it useful in our daily lives. However, you should remember that it has no mass. There is no way that we can live without it. In fact, we can't even see the Sun without seeing the moon.Light energy comes from the Sun, which is millions of miles away, and it transfers a tremendous amount of energy to Earth at a speed of 300, 000 km per second. As you can imagine, light is very important to our lives because plants absorb light and convert it into food. This energy is also useful in our homes because it can be converted into thermal energy by burning candles. Whether you use a candle or a flashlight to read a book, the sun is an incredible source of light.There are two kinds of light sources on Earth. One is natural and the other is man-made. The sun is the largest source of light energy, but it travels at such high speeds that it slows down considerably. Different mediums absorb light and slow it down. For example, glass has a refractive index of 1.5, which means it slows down light by about 200, 000 km per second. Water and air have refractive indexes of 1.0003, which makes them ideal for light-related experiments.