By International aggreement, the speed of light in vaccuum is now defined to be

Question

By International aggreement, the speed of light in vaccuum is now defined to be 299,792,458 m/s. For this problem and all others that follow, you may take the speed of light to be 3.0 x 108 m/s unless otherwise stated. (Just for comparison purposes, this speed corresponds to 186,000 miles/second.)

1) The average distance between the Sun and the Earth is 1.50 x 108 km. How long does it take light from the Sun to reach Earth? (minutes)

2) The average distance between the Earth and the Moon is 3.84 x 105 km. How long does take a laser pulse emitted from Earth to reach the Moon and reflect back? (s)

3) In an experiment performed by Albert Michelson in 1926, a beam of light from a rotating mirror traveled 15 km to a stationary mirror and back. How long did it take the light to make this trip? (s)

Explanation / Answer

as per chegg guidelines i can answer only one.

1)distance = 1.5 x 10^ 8 km
velocity of light = 2.99*10^8 kilometers per second
time = distance / velocity = (1.5 x 10^ 8 ) / 2.99*10^8= 500 seconds =
8 minutes and 20 seconds ans.

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