Question

HOW TO DETERMINE THE SPEED OF LIGHT.. ​

Answer 1

When the Earth is farther away, it takes light from Io longer to get to Earth resulting in a longer apparent orbital period of Io. So, just measuring the change in apparent period and the change in distance gives an estimate for the speed of light. This is exactly how Roemer estimated the speed of light.

Answer 2

Answer: Here's ur answer mate ✔⤵

Light travels really fast . its so fast that it's quite difficult to determine a value for the speed of the light.But it's just the speed of the light that is important. This value also appears in other places like the energy to mass equivalence principle ( E = * mc2*).

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=> When the earth is farther away,it takes light from no longer apparent orbital period of lo.So,just measuring the change in apparent period and the change in distance gives an estimate for the speed of the light.This is exactly how Roemer estimated the speed of the light.

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