Question

If the sun is 150 million km away from the earth, how long does it take sunlight to reach the earth?

0.5 s
1500 s
45 s
500 s

Answer 1

Answer on Question 52753, Physics, Optics

Question:

If the Sun is 150 million kilometers away from the Earth, how long does it take sunlight to reach the Earth?

a) 0.5s

b) 1500s

c) 45s

d) 500s

Solution:

In order to find time that needs sunlight to reach the Earth we divide the distance to the Sun by the speed of light and obtain:

$$t = \frac {d}{c} = \frac {1.5 \cdot 10^{11} m}{3 \cdot 10^{8} \frac {m}{s}} = 500s.$$

Answer:

d) 500s

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