Question

What is the time taken for lightvto reachbetween earth and jupiter?

Answer 1

Jupiter is about 4 AU from the Earth at opposition (that is when Earth and Jupiter are aligned on the same side of the Sun)

5 AU - 1 AU = 4 AU
1 AU = 150,000,000 kilometers

So this (4 AU) is about 600,000,000 kilometers

Light travels at 300,000 kilometers/sec

Therefore, the time it takes light (or radio waves) to travel from the Earth to Jupiter (or vice-versa) when the two planets are closest is

(600,000,000 kilometers) / (300,000 kilometers/second)
= 2,000 seconds
= about 33 minutes
Remember, this is when the planets are closest to one another.
Any other time it will take even longer.