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Units And Measurement

Question

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Can we use echo method to find very small distances of the order of nanometer?

Solution

Yes. Echo method can be used to measure small distances of the order of nanometer.
The techniques used are interference and diffraction.

Some More Questions From Units and Measurement Chapter

What are the two main required characteristics of a unit?

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?

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