Speed of light in vacuum is?

Question

1. 2x10-9 m/s
2. 3x 10-9 m/s
3. 3x 10-8 m/s
4. 2x10-8 m/s

Answer 1

The exact speed of light in a vacuum is 299,792,458 m/s, or about 3 x 10^8 m/s. So it appears to be answer 3, "3x 10-8 m/s", which is badly formatted. In general, it's also a bad idea to use numbers to indicate choices that are themselves numbers. It makes it look like the choices are

1.2 x 10^-9 m/s
2.3 x 10^-9 m/s
3.3 x 10^-8 m/s
4.2 x 10^-8 m/s

instead of, presumably,

2 x 10^9 m/s
3 x 10^9 m/s
3 x 10^8 m/s
2 x 10^8 m/s

Answer 2

3

Answer 3

3

Answer 4

3*10^8 m/s

Answer 5

The speed of an electromagnetic wave is the product of the frequency and the wavelength. In a vacuum this speed is the same for all wavelengths. The speed of light in material substances is less than in a vacuum, and is different for different wavelengths, an effect called dispersion. The ratio of the speed of light in vacuum to the speed of a particular wavelength of light in a substance is known as the index of refraction of that substance for the given wavelength. The index of refraction of air for all wavelengths is 1.00029, but for most applications it is sufficiently accurate to take it to be 1.

Answer 6

The speed of light don't change no matter what median it is in it will always be 3x10-8 m/s even if you are going at the speed of ilght which brings many theries of relativity in to play. If you are going the speed of another object your speed relative to that object is 0 but if you are going the speed of light then its speed relative to you is still 3x10-8 m/s cool yea. Note this is a theory ( not mine)

Answer 7

Speed of light in vaccum is 3x 10^8m/sec