The international standard of Length is defined in terms of : -

 The international standard of Length is defined in terms of : - a) Length of earth's meridian passing through Paris b) The distance between two lines engraved on a Platinum -iridium Bar c,) Wavelength in vacuum, of radiation of Krypton -86 atom cP None of the above
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 The international standard of Length is defined in terms of : - The distance between two lines engraved on a Platinum -iridium Bar 

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