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Approximately how long does it take a light wave to travel from your head to your toes?

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Approximately how long does it take a light wave to travel from your head to your toes? Assume you are standing straight up.

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The speed of light is a fundamental constant so we can determine the time needed to c...View the full answer


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Sagar Kumar
I am Mechanical Engineer with CGPA of 3.98 out of 4.00 from Pakistan. I went to Government Boys Degree College, Sehwan for high school studies. I appeared in NUST Entrance Exam for admission in university and ranked #516. My mathematics are excellent and I have participated in many math competitions and also won many of them. Recently, I participated in International Youth Math Challenge and was awarded with Gold Honor. Now, I am also an ambassador at International Youth Math Challenge, I have been teaching when I was in 9th class class year 2012. I have taught students from 6th class to university level.
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Related Book For  answer-question
College Physics Reasoning and Relationships

College Physics Reasoning and Relationships

ISBN: 978-0840058195

2nd edition

Authors: Nicholas Giordano

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Related Video

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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