Q317
A star is 8.1 × 1013 km away from the earth. Suppose light travels at the speed of 3.0 × 105 km per second. How long will it take the light from the star to reach the earth ?
A.
7.5 × 103 hours
B.
7.5 × 104 hours
AnswerC.
2.7 × 1010 seconds
D.
2.7 × 1011 seconds
Answer: Option B
Solution
Answer: Option B
Solution:
Required time :