It takes 5 years for light to reach the earth from a star. Express the distance of the star from the earth in
i) light year
ii) km.
Take speed of light = 3 * 10^8 m/s and 1 year = 3.153 * 10^7 s.
Answers
Hey there!
i) The distance travelled by the light in 1 year is called 1 light year.
Thus the distance travelled by light in 5 years = 5 light years.
ii) 1 light year = Speed of light * time in 1 year
= (3 * 10^8) * (3.153 * 10^7) = 9.46 * 10^15 m = 9.46 * 10^12 km
Distance of a star from the earth = 5 * 9.46 * 10^12 km = 4.73 * 10^13 km
Hope It Helps You!
Answer:
Hey there!
i) The distance travelled by the light in 1 year is called 1 light year.
Thus the distance travelled by light in 5 years = 5 light years.
ii) 1 light year = Speed of light * time in 1 year
= (3 * 10^8) * (3.153 * 10^7) = 9.46 * 10^15 m = 9.46 * 10^12 km
Distance of a star from the earth = 5 * 9.46 * 10^12 km = 4.73 * 10^13 km
Hope It Helps You!
Explanation:
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