Solution Found!
(II) A light-year is the distance light travels in one
Chapter 20, Problem 22P(choose chapter or problem)
Problem 22P
(II) A light-year is the distance light travels in one year (at speed = 2.998 X 108 m/s)(a) How many meters are there in 1.00 light-year? (b) An astronomical unit (AU) is the average distance from the Sun to Earth. 1.50 X 108 km How many AU are there in 1.00 light-year?
Questions & Answers
QUESTION:
Problem 22P
(II) A light-year is the distance light travels in one year (at speed = 2.998 X 108 m/s)(a) How many meters are there in 1.00 light-year? (b) An astronomical unit (AU) is the average distance from the Sun to Earth. 1.50 X 108 km How many AU are there in 1.00 light-year?
ANSWER:
Step 1 of 3
(A) Speed of light C = 2.998 x 108 m/s
Hence 1 light year = ( 2.998x108 m/s)(3.156 x 107 s)
1.00 light year = 9.46 x 1015 m
Therefore 1.00 light year = 9.46 x 1015 (The least number of significant figures is 3 as given
in 1.00 light year, so the answer should have maximum 3 significant figures)