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What is light explain

of Toronto.The fine print: There are actually other ways to bend or deflect light, including diffraction gratings and holographic lenses. However, the light pattern on the screen was more diffused/ diffracted, which indicated that light has an interference property, just like those exhibited by energy waves. Demo courtesy of Mr. David M. Harrison, Dept. No one had actually seen particles of light, but even now, it's easy to explain … The light year is used in astronomy because the universe is huge. Since the speed of light is about 300,000 km per second (about 186,000 miles per second), then a light year is about 10 trillion kilometers (about 6 trillion miles). of Physics, Univ. So in one year, it can travel about 10 trillion km. Answer: A light-year is a unit of distance. Light is produced, controlled, and detected in so many ways around you!

We also share information about your use of our site with our social media, advertising and analytics partners who may combine it with other information that you’ve provided to them or that they’ve collected from your use of their services. A light year is not a length of time.

These depend on the wave nature of light, and are a little more difficult to explain. It is the distance that light can travel in one year. ), but light is the part WE can see, the part that makes the rainbow. ©2020 Synopsys, Inc. All Rights Reserved In 1704, Newton proposed a different take -- one describing light as corpuscles, or particles. It's a kind of energy called "electromagnetic (EM) radiation" (but this kind of radiation is not harmful, except for an occasional sunburn). Weird & WackyWe use cookies to personalise content and ads, to provide social media features and to analyse our traffic. It is a small part of the electromagnetic spectrum and radiation given off by stars like the sun.Animals can also see light. As proposed by Einstein, light is composed of photons, a very small packets of energy. Light moves at a velocity of about 300,000 kilometers (km) each second. A source of light makes light. The Sun and other stars, fires, torches and lamps all make their own light and so are examples of sources of light. Click on the image below to see the interactive demo. Isaac Newton was one of those people. of Toronto.Change its direction by making it pass into another transparent material of different density, like glass or water.

Interference is a phenomenon in which two waves (considered to be linear systems) either have an additive or subtractive effect on each other’s intensity, which make the resultant wave either greater or lower in amplitude. Click on the image below to see the interactive demo. These depend on the wave nature of light, and are a little more difficult to explain. After all, light travels in straight lines and bounces off a mirror much like a ball bouncing off a wall. What is a light-year. The reason that photons are able to travel at light speeds is due to the fact that they have no mass and therefore, Einstein's infamous equation - E=MC 2 cannot be used. Scientists have also found that gravity can bend light, but it takes a very large object with strong gravity such as a star to bend light very much, so it's not an effect you see every day!Light is produced, controlled, and detected in so many ways around you!Put your mouse over the following image to see what they are. More p recisely, one light-year is … Demo courtesy of Mr. David M. Harrison, Dept.

This is called REFRACTION, and it's how lenses work.

A light nanosecond-- the distance light can travel in a billionth of a second -- is about 1 foot (about 30 cm).Radar uses this fact to measure how far away something like an airplane is. What is Light? Scientists have also found that gravity can bend light, but it takes a very large object with strong gravity such as a star to bend light very much, so it's not an effect you see every day! While it's waiting, it counts the number of nanoseconds that pass. There are other kinds of EM radiation too (radio waves, microwaves, x-rays, etc. Photon Model of Light. Ancient Greeks argued over whether light rays emanated from a person's eye or the object being viewed. A radar antenna sends out a short radio pulse and then waits for it to echo off an airplane or other target. and how is it used? Light is a form of electromagnetic radiation with a wavelength which can be detected by the human eye. of Physics, Univ. A light year (symbol: ly) is the distance that light travels in empty space in one year. There are THREE basic ways to control light (these activities require This is called a REFLECTION. You consent to our cookies if you continue to use our website. The study of light, known as optics, is an important research area in modern physics.When light hits an opaque object it forms a shadow.

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