The speed of light is 3.00*108m/s. How long does it take for light to travel from Earth to the Moon and back again? Express your answer using two significant figures.

Question

Jaidyn Barr

Physics

4 August, 13:12

The speed of light is 3.00*108m/s. How long does it take for light to travel from Earth to the Moon and back again? Express your answer using two significant figures.

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Answers (1)

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Donuts · Answer 1

v = 3*10^8 m/s

s = 384,400 km = 3.84*10^8 m/s

t = ?

v = s/t = 2s/t

t = 2s/v

t = (2*3.84*10^8) : 3*10^8

t = 2.56 seconds

Explanation:

Earth's moon is the brightest object in our

night sky and the closest celestial body. Its

presence and proximity play a huge role in

making life possible here on Earth. The moon's gravitational pull stabilizes Earth's wobble on its axis, leading to a stable climate.

The moon's orbit around Earth is elliptical. At perigee - its closest approach - the moon comes as close as 225,623 miles (363,104 kilometers). At apogee - the farthest away it gets - the moon is 252,088 miles (405,696

km) from Earth. On average, the distance fromEarth to the moon is about 238,855 miles (384,400 km). According to NASA, "That means 30 Earth-sized planets could fit in between Earth and the moon."