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Units and Measurement
Question
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What is the mass of electron, proton, moon, earth and Universe.

Answer

The mass of entities is given by,

Entity

Electron

Proton

Moon

Earth

Universe

Mass

9.1x1031 kg

1.67x10–27 kg

7.33x1022 kg

5.98x1024 kg

2.23x1038 kg
 

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Some More Questions From Units and Measurement Chapter

Define physical quantity.

 

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?