define si standard of length (I.e)metre
physics
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The standard meter is the length of the path travelled by the light in vacuum during a time interval of 1/299792 of a second. The meter is the length of the path travelled by light in vacuum during a time interval of 1/299792 of a second.
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The metre is defined by takig the fixed numerical value of the speed of light in vacuum, c, to be 299,792,458 when expressed in m/s, where the second is defined in terms of caesium frequency.
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