Why light has a speed limit

Описание: Why light has a speed limit
𝗜𝗻𝗱𝗲𝘅:
⏲ 0:00 Speed of light
⏲ 0:12 Electromagnetic Radiation
⏲ 0:40 Vacuum (Free Space - Empty Space)
⏲ 1:43 Vacuum Permittivity and Vacuum Permeability
⏲ 2:26 Maxwell Equation
⏲ 2:59 Why is speed of light about 300,000 km/s (186,000 miles/s)
⏲ 3:21 How speed of light can be different

📫𝐎𝐮𝐫 𝐅𝐁 𝐏𝐚𝐠𝐞:
  / scienceworld-106933907791981  

🎬𝐈𝐦𝐚𝐠𝐞𝐬, 𝐚𝐧𝐢𝐦𝐚𝐭𝐢𝐨𝐧𝐬 𝐚𝐧𝐝 𝐯𝐢𝐝𝐞𝐨𝐬 𝐜𝐫𝐞𝐝𝐢𝐭𝐬:
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📕 𝗪𝗲𝗶𝗿𝗱 𝗠𝗮𝘁𝗵𝘀: 𝗔𝘁 𝘁𝗵𝗲 𝗘𝗱𝗴𝗲 𝗼𝗳 𝗜𝗻𝗳𝗶𝗻𝗶𝘁𝘆 𝗮𝗻𝗱 𝗕𝗲𝘆𝗼𝗻𝗱
(https://www.amazon.com/Weird-Maths-Ag...)
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(https://www.amazon.com/Weirder-Maths-...)
📗 𝗪𝗲𝗶𝗿𝗱𝗲𝘀𝘁 𝗠𝗮𝘁𝗵𝘀: 𝗔𝘁 𝘁𝗵𝗲 𝗙𝗿𝗼𝗻𝘁𝗶𝗲𝗿𝘀 𝗼𝗳 𝗥𝗲𝗮𝘀𝗼𝗻
(https://www.amazon.com/Weirdest-Maths...)
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📄𝐓𝐞𝐱𝐭:
Light is a type of electromagnetic radiation, which travels about 300,000 km (or 186,000 miles) per second in a vacuum. As well visible light, radio waves, microwaves, infrared, ultraviolet, X-rays and gamma rays types of electromagnetic radiation. All of these travel at speed of light which is an ultimate barrier – or is it? In order to understand why the speed of light is about 300,000 km per second in a vacuum, we need to clearly understand what a vacuum, or free space, is.

We generally suppose, apart from material objects, such as planets, stars, and asteroids, that space is empty. But that’s not strictly true. So-called empty space contains gas, dust, charged particles, light from stars, cosmic rays, radiation left over from the Big Bang, neutrinos from nuclear reactions, and gravitational, electric, and magnetic fields. Empty space is also filled with dark energy and dark matter, which we can’t directly detect. Even if we could remove all of these components, space would still have vacuum energy, the Higgs field, and its internal shape or curvature, which can’t be taken out. So empty space is not nearly as empty as we usually think! Among the properties to which the unseen components of empty space give rise are vacuum permittivity and vacuum permeability.

In physics, vacuum permittivity can be thought as resistance to the formation of electric fields, whereas vacuum permeability can be thought as resistance to the formation of magnetic fields. So, by its very nature, our universe sets limits on the speed of interactions between magnetic and electric fields. Since electromagnetic radiation consists of electric and magnetic fields, the universe also limits on the speed of electromagnetic radiation – in other words, the speed of light.

We can measure the values of vacuum permittivity and vacuum permeability experimentally. In 1864, Scottish scientist James Clerk Maxwell combined laws found by Faraday, Ampere, Lenz and Gauss and found the value of the speed of light. So, as you can see the speed of light depends on vacuum permittivity and vacuum permeability.

Why is the speed of light about 300,000 km (186,000 miles) per second in a vacuum or in free space? Now we know the answer: the structure of space limits the speed of interactions between magnetic and electric fields and these interactions, in turn, place a limit on the speed of light. If we were in a different universe in which the vacuum permittivity and vacuum permeability were different, then the speed of light would also be different.

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