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(a) The distance to the North Star, Polaris, is approximately 6.44 x 1018 m. If Polaris were to burn out...

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(a) The distance to the North Star, Polaris, is approximately 6.44 x 1018 m. If Polaris were to burn out today, in what year would we see it disappear?
(b) How long does it take for sunlight to reach the Earth?
(c) How long does it take for a microwave radar signal to travel from the Earth to the Moon and back?
(d) How long does it take for a radio wave to travel once around the Earth in a great circle, close to the planet’s surface?
(e) How long does it take for light to reach you from a lightning stroke 10.0 km away?

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a b c d e Since the light from this star travels at 3 00108 m s 6 44108 m 3 00108 …View the full answer


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Related Book For  answer-question
College Physics

College Physics

ISBN: 978-0321601834

7th edition

Authors: Jerry D. Wilson, Anthony J. Buffa, Bo Lou

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Question Posted: January 25, 2010 03:54:52
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Using a few basic physics principles, you can impress your friends with a trick that makes a bottle disappear. For this experiment, you will need a mini plastic bottle, glycerin, a glass, and a funnel. First, open the bottle and pour some glycerin into it, then close the bottle tightly. Next, pour some water into the glass using a funnel. Place the mini bottle into the glass of water and it will look normal. This is because light travels through air faster than it travels through the glass and water, allowing our eyes to see the bottle inside the glass. However, when you fill the mini bottle with more glycerin, and pour glycerin into the glass, then put the glycerin filled bottle into the glass with glycerin in it. Half of the bottle that is submerged in the glycerin will become invisible as the light travels through glass and glycerin at the same speed, thus it does not bend and no refraction takes place, making the bottle invisible. This happens because both glass and glycerin have almost the same refractive index, which causes the speed of light to be the same in both mediums, causing no bending of light and making the bottle disappear.

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