Astronomical unit

Classical Mechanics Level 1

An astronomical unit (abbreviated as AU) is a unit of length now defined as about 1.5 × 1 0 8 1.5 \times 10^8 km(about 93 93 million miles), or roughly the mean Earth–Sun distance. A light-year (symbol: LY), is a unit of length (not time), too. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year. If the speed of light in vacuum is 3 × 1 0 8 3 \times 10^8 m/s, then how many AU's are there in a LY?

63072 AU 1051.2 AU 2628 AU 172.8 AU

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Lakshan Dumpa by Lakshan Dumpa , 24, India

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2 solutions

Santanu Banerjee
Mar 9, 2014

Time taken by light to reach the earth (approx) 8.5 mins

Convert 1 year in minutes and divide by 8.5 and you will get a close answer ...

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Drupath Krishna
Mar 10, 2014

time taken by light to reach the earth 8.5 mins convert 1 yer in minutes and divide by 8.5 and you will got a close answer

0 Helpful 0 Interesting 0 Brilliant 0 Confused

Convert 1 year in seconds multiply it to the speed of light and convert meter to km and then use this no. of AU = LY/AU you'll get 63072.

wilson go ping - 7 years, 2 months ago

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