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InterviewSolution
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The metre is defined as the distance travelled by light in 1299, 792, 458second. Why didn’t people choose some easier number such as 1300, 000, 000second? Why not 1 second? |
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Answer» The speed of light in vacuum is 299,792,458 m/s. Then time taken by light to cover a distance of 1 metre in vacuum = 1299, 792, 458s Hence, the metre is defined as the distance travelled by light in 1299, 792, 458s. As 300,000,000 m/s is an approximate speed of light in vacuum, it cannot be used to define the metre. The distance travelled by light in one second is 299,792,458 m. This is a large quantity and cannot be used as a base unit. So, the metre is not defined in terms of second. |
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