可见光仅占电磁波谱中的极小部分。我们的眼睛只能感受到其中一定的波长范围

Visible only a very small portion of the electromagnetic spectrum. Our eyes can only sense in which a certain wavelength range, and feel gamma rays, X-rays, infrared and ultraviolet radiation. Light travels almost unimaginable speed. C is the velocity of light 3 × 108 meters per second, the speed of sound in air is 330 meters per second. Propagation speed of the light speed of sound faster than about 100 times! In the real world, the speed of light is the limit to be considered. Photons emitted by the sun's surface would take eight minutes to reach our planet. C is a constant fundamental constants of the universe where we are, no one can tell us why it will be such a value. If c is another value, especially when it is a very small value (for example, the speed of sound of magnitude), the speed will slow down communication, we can receive hair from the rest of the planet over the news after take many hours; jet ride Air travel also is not safe, because we do not know what will be in front of something.

Visible light represents only a tiny fraction of the electromagnetic spectrum. Our eyes can only feel a certain wavelength range, not gamma rays, X-rays, infrared, and ultraviolet radiation. Light travels at an almost unimaginable speed. The speed of light c is 3 x 108 meters per second, while the speed of sound in the air is 330 meters per second. Light travels about a million times faster than sound! In the real world, the speed of light is considered to be the limit. It takes eight minutes for the photons from the surface of the sun to reach our earth. Constant c is the basic constant of our universe, and no one can tell us why it has such a number. If c is another value, especially if it is a very small number (e.g. an order of magnitude of sound velocity), the speed of communication will slow down, and it will take many hours for us to receive news from the rest of the planet;

Visible light only accounts for a very small part of the electromagnetic spectrum. Our eyes can only feel a certain range of wavelengths, but not gamma rays, X-rays, infrared and ultraviolet radiation. Light travels at an almost unimaginable speed. The speed of light C is 3 × 108 meters per second, while the speed of sound in the air is 330 meters per second. Light travels about a million times faster than sound! In the real world, the speed of light is considered to be the limit. It takes eight minutes for photons from the sun's surface to reach our earth. The constant C is the fundamental constant of our universe. No one can tell us why it has such a value. If C is another value, especially when it is a very small value (such as the order of sound speed), the speed of communication will slow down, and it will take many hours for us to receive news from other parts of the earth; it will also be unsafe to travel by jet because we don't know what is going to be in front of us.<br>