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A light-year is the distance light travels in one year, at a speed = 2.998 x 10^8 m/s.

(a) How many meters are there in 1.00 light years?
(b) An AU is the average distance from the Sun to the Earth, 1.50 x 10^8 How many AU are there in 1.00 light-year?
(c) What is the speed of light in AU/h? ...?

Answer :

scme1702
A)
1 year = 365 days x 24 hours per day x 60 minutes per hour x 60 seconds per minute
Seconds in one year = 31536000 seconds
Distance covered = 2.99 x 10⁸ x 31536000
= 9.43 x 10¹⁵ m

B)
9.43 x 10¹⁵ / 1.5 x 10⁸ 
= 6.29 x 10⁷ AU

C) 2.99 x 10⁸ m/s x 60 s/min x 60 min/hr x 1AU/1.5 x 10⁸ m
= 7176 AU/hr

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