Waves, Sound and Light

1038 WordsJun 10, 20125 Pages
Its weird how some people don’t question the things that are obvious to us. The things we see, how do we see it? What makes it visible to us? Is it only because we have eyes, or is there another factor. The great Aristotle explained it by having something in our eyes that emits “something” to an object and that’s why things are visible to us. Another question we could ask from our daily life is that how come we can hear? What is it that we hear? Why do we hear it and deaf people don’t? How do we receive any sound? People use sound all the time. We rely on sounds to communicate. Unexpected noises may warn us of danger. The sounds we hear tell us a lot about our surroundings. Many animals also use sound. Even animals that live in water.…show more content…
Anything above or less than the frequencies I just mentioned, humans can’t hear. Now, we’ll talk about light which is not less interesting than sound. Ancient Greeks tried to understand the meaning of light. Pythagoras proposed that vision resulted from light rays emerging from a person's eye and striking an object. Epicurus argued the opposite: Objects produce light rays, which then travel to the eye. Other Greek philosophers like Euclid and Ptolemy used ray diagrams quite successfully to show how light bounces off a smooth surface or bends as it passes from one transparent medium to another. Newton proposed light as corpuscles, or particles. After all, light travels in straight lines and bounces off a mirror much like a ball bouncing off a wall. No one had actually seen particles of light, but even now, it's easy to explain why that might be. The particles could be too small, or moving too fast, to be seen, or perhaps our eyes see right through them. Light as ray, imagining light as a ray makes it easy to describe, with great accuracy, three well-known phenomena: reflection, refraction and scattering. I will explain each one briefly. Reflection is when a light ray strikes a smooth surface, such as a mirror, and bounces off. Scattering for example is when a light hits paper; the waves are reflected in all directions. Refraction occurs when a ray of light passes from one transparent medium (air, let's say) to a second transparent
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