1 pico second =..........second

10-12
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Name the method that is used to measure the distances of planets or stars from the earth.

Parallax method.
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Name the fundamental quantity that has same unit in all the three system of units.

Time.
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What is unit of length in MKS system?


Meter is the unit of length in MKS system. 
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What is unit of length in FPS system?

Foot is the unit of length in FPS system. 
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