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प्रश्न
A body measures 25 m. State the unit and the magnitude of the unit in the statement.
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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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