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it should be 3x10^8 m s^(-1). here is the calculation:
we have known that the refractive index of vacuum is 1,
by n= v/c ( n stands for refractive index of medium, v stands for the speed of light in medium, c stands for speed of light constant)
1=v/3X10^8 m s^(-1)
v=
therefore, speed of light in vacuum is 3x10^8 m s^(-1)
actually, all light ray in electromagnetic spectrum have same speed in vacuum
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They are equal.
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In a vacuum, all types of light, such as visible light, radio waves, and X-rays, travel at the same speed, which is the speed of light, approximately 299,792 kilometers per second. This is a fundamental property of light in a vacuum known as the speed of light constant.
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