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Units and Measurement
Question
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Define the unit meter on atomic scale. 

Answer

Unit metre on atomic scale is defined as the distance occupied by 1650763.73 waves (in vacuum) emitted due to electronic transition from 5d5 to 2p10 by individual atom of Krypton-86 isotope. 

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Some More Questions From Units and Measurement Chapter

Can we use same units for different physical quantities?

Can we use different units to measure same physical quantity?

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?

Can a physical quantity have two or more units? Give example.

What are fundamental quantities?

How many fundamental quantities are there in mechanics?