Sound travels at about 1090 legs per second or 330 meters per second while light travels at 186, 000 miles per second or 2997 9 2.458 kilometers per second. That's how light from the sunlight comes to us or how we may see the light from distant stars. Wavelengths - Light waves have wavelengths. That's the distance between the crest of one wave and the crest of the next wave. Each type of light moves with a different wavelength. Some, like x rays, move in a nutshell wavelengths. These waves have a big amount of energy. UV waves from the sun are another example. We may get sunburned or worse when overexposed to the UV waves in sunlight. Visible light shifts to a more medium wavelength that's the reason why we may see it. But even visible light has numerous different wavelengths within it. More on that later. Then there are the longer wavelengths. These include radio and TV waves and also microwaves. You may even have a microwave to cook with in your kitchen. Longer and shorter wavelengths aren't visible to our eyes without special equipment. Only visible light moves so that we may see it. Visible Light Each type of light moves at a certain wavelength. The shorter waves will be on one end and the longer ones will be on the other. Then as the wavelengths get longer and longer, the visible light changes in colour to blue, green, yellow, orange, and lastly the longest, which is red. Some animals can see wavelengths of light that humans cannot. Those wavelengths will be just outside the edges of human visible light. For instance, insects can see ultraviolet waves just before purple on the electromagnetic spectrum. But we're not able to see these. In the same time, there are colours of red that insects are unable to see, but that humans can. Most light that we use as sunlight or light from a light bulb is in fact a mixture of all of the visible light wavelengths. When it's mixed, it's difficult for us to separate the colours out. We just see it as useful light. The visible spectrum of light is frequently mixed together in what's called white light. We don't see each one of the colours when they are mixed together. This could happen in a rainbow. When light passes through certain materials like water droplets from a storm or a sprinkler, the light can bend.