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Question
Define metre in terms of the wavelength of light.
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Solution
One metre is defined as 1,650,763.73 times the wavelength of a specified orange-red spectral line in emission spectrum of Krypton = 86.
OR
One metre is defined as 1,553,164.1 times the wavelength of the red line in the emission spectrum of cadmium.
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Describe the procedure to measure the diameter of a wire with the help of a screw gauge.
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