GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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glass
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water
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vacuum
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hydrogen
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Detailed explanation-1: -The speed of light traveling through a vacuum is exactly 299, 792, 458 meters (983, 571, 056 feet) per second. That’s about 186, 282 miles per second-a universal constant known in equations as “c, ‘’ or light speed.
Detailed explanation-2: -Light travels faster in vacuum than any other medium. This is because there is no obstruction in vacuum for the propagation of light and thus, the refractive index of vacuum is the lowest.
Detailed explanation-3: -In a vacuum, the speed of light is constant. So, they are traveling at the same speed. In a block of glass, the speed of light is proportional to the wavelength of the light. So, red light travels fastest among them.
Detailed explanation-4: -Surprisingly, the answer has nothing to do with the actual speed of light, which is 300, 000 kilometers per second (186, 000 miles per second) through the “vacuum” of empty space.
Detailed explanation-5: -Red light having maximum wavelength travels fastest.