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Which of the following is true about the speed of light?

A - It is a constant when the light is traveling in a vacuum.

B - It speeds up or slows down depending on the observer.

C - It is slowest in a vacuum.

D - It varies depending on the color of the light.

Respuesta :

Answer: A - It is a constant when the light is traveling in a vacuum.

Explanation: "Light in a vacuum always travels at the same speed." Those additional three words in a vacuum are very important. A vacuum is a region with no matter in it. So a vacuum would not contain any dust particles (unlike a vacuum cleaner, which is generally full of dust particles).

The speed of light remain is same throughout the same medium. The true statement is, speed of light is a constant, when the light is traveling in a vacuum.

What is speed of light?

Speed of light is the rate of speed though the light travels. The speed of light in the vacuum is almost equal to the [tex]3\times10^8[/tex] meter per second

Lets check all the option one by one-

  • A) It is a constant when the light is traveling in a vacuum- The speed of light in the vacuum is almost equal to the [tex]3\times10^8[/tex] meter per second. This value is constant for the vacuum. Thus this option is correct.

  • B - It speeds up or slows down depending on the observer. The speed of light remain same throughout the same medium. Thus this option is incorrect.

  • C - It is slowest in a vacuum-The speed of light has the maximum value in the vacuum. Thus this option is incorrect.

  • D - It varies depending on the color of the light- Speed of light for different color or wavelength remains same.Thus this option is incorrect.

Hence, the speed of light is a constant, when the light is traveling in a vacuum. The option A is correct option.

Learn more about the speed of light here;

https://brainly.com/question/104425

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