PhysLink.com: Physics and Astronomy Online

Time 2020-09-10 04:02:39

Web Name: PhysLink.com: Physics and Astronomy Online

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Physics and Astronomy Online Welcome to PhysLink.com - the physics and astronomy online portal! We feature latest physics news and editorials, extensive science reference and constants section, education section where you can ask our experts any physics or astronomy related question. Also, don't miss our fun page and our online science store. Somewhere Over Which Rainbow? byWillaLarsen and ScienceIQ.com How many rainbows are there really when we only see one during a rainstorm? The answer isn't as simple as you might think! Rainbows are formed when light enters a water droplet, reflects once inside the droplet, and is reflected back to our eyes. Each raindrop reflects and refracts the light that enters it in all possible ways. When light first hits the drop, a fraction of that light is reflected and the rest is transmitted through until it hits the backside of the drop on the inside. Again, some of that light is refracted and some is reflected. At each encounter with the surface inside the drop, some of the light is reflected and remains inside the drop, and the rest escapes. Therefore, light rays can escape after one, two, three or more internal reflections.When you see two rainbows, the first or primary bow at 42 degrees, is brighter with red on the outside ending with violet on the inside. The secondary bow at 51 degrees is always fainter with the colors reversed due to the second reflection; violet on the outside ending with red on the inside. Isaac Newton derived a mathematical equation for the angular size of rainbows after a number (N) of reflections inside the droplet. He never solved the problem for N=3, since he decided that in the third pass there wouldn't be enough light for a person to actually see it. Edmund Halley, after whom Halley's comet was named, carried the calculations through and discovered that the tertiary rainbow would actually appear with an arc of 40 degrees and 20 seconds, and surprise! It should appear not opposite the sun but around the sun itself! For two thousand years, men had been looking for this arc in the wrong part of the sky! MercuryThe small and rocky planet Mercury is the closest planet to the Sun; it speeds around the Sun in a wildly elliptical (non-circular) orbit that takes it as close as 47 million km and as far as 70 milli ... What Makes a Frisbee Fly?If you have ever been to the park or the beach, you've probably seen one of these plastic discs flying through the air. We're not talking about a UFO, we're talking about the Frisbee, more commonly kn ... Neutrinos to the RescueHave you ever wondered what the most abundant particle in the universe is after photons of light? The answer is: Neutrinos. These tiny, neutral and almost mass-less particles that move at almost the ...'There comes a time when the mind takes a higher plane of knowledge but can never prove how it got there. All great discoveries have involved such a leap. The important thing is not to stop questioning.'Albert Einstein(1879-1955) Beyond the bubbling volcano: Secrets to successful science fair projects We have put together a list of tips to help you and your child find and develop a successful science fair project. In addition, we've added age appropriate guidelines when needed. 10 Ways to Keep Your Kids Interested In Science Young children are natural scientists: they ask questions, pick up sticks and bugs outside, and are curious about the world around them. But as they get a bit older, many kids gradually lose their interest in science. Here are tips to get them excited about science again! Cool Summer Science Projects Summer is a natural time for learning about science. Longer days and the freedom from school schedules allow kids the opportunity to explore the world around them in new and exciting ways. Here are a few ideas to help get you started. PhysLink.com Comprehensive physics and astronomy online education, research and reference web site founded in 1995 by a physicist Anton Skorucak.

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