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Units And Measurement

Question

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Define candela.

Solution

The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency

540 \times 10^{12}

hertz and that has a radiant intensity in that direction of

\frac{1}{683}

watt per steradian.

Some More Questions From Units and Measurement Chapter

Give four examples of physical quantities.

Define unit.

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.

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