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प्रश्न
A body measures 25 m. State the unit and the magnitude of the unit in the statement.
उत्तर
Here S.I. unit of length i.e. metre (m) has been used. The magnitude of the given quantity = 25
Metre: It is defined as 1,650,763,73 times the wavelength of the specified orange-red spectral line an emission spectrum of Krypton-86 or 1,553,164.1 times the wavelength of the red line in the emission spectrum of cadmium.
or one metre is defined as the distance travelled by the light in 1/299,792,458 of a second in air/vacuum.
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