Question on world &measurment
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Question on world &measurment

[From: ] [author: ] [Date: 13-02-26] [Hit: ]
Each day is 24 hours with 60 minutes each and 60 seconds a piece.You could do this the easy way or the hard way.The hard way is to say distance = speed X time, which means determining how many seconds are in 2 billion years then multiplying by the speed of light.Thats way too hard.1 Lightyear is the DISTANCE light travels in 1 year.......
Calculate the distance of a quasar from which light takes 2 billion years to reach the earth.explain the method.

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Light travels 300,000 km/second. A year is composed of 365 days (except leap years). Each day is 24 hours with 60 minutes each and 60 seconds a piece. You could do this the easy way or the hard way. The hard way is to say "distance = speed X time", which means determining how many seconds are in 2 billion years then multiplying by the speed of light.

That's way too hard.

1 "Lightyear" is the DISTANCE light travels in 1 year. Therefore, if a beam of light from a quasar takes 2 billion years to reach earth, the quasar would be "2 Light Years away".

Just for craps and giggles, this amounts to 18,920,000,000,000 kilometers or almost 19 trillion miles away!

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Light travels at 300,000,000 m/s, so convert 2,000,000,000 years to seconds and multiply.
2x10^9 years = 6.31x10^16 sec.
(3x10^8 m/s)*(6.31x10^16 sec) = 1.91x10^25 m
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