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Units and Measurement

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Physics Part I

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
When the planet Jupiter is at a distance of 824.7 million kilometers from the Earth, its angular diameter is measured to be 35.72” of arc. Calculate the diameter of Jupiter.

Given comma space

Angular space diameter comma space straight theta space equals space 35.72 " space

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space fraction numerator 35.72 " over denominator 3600 end fraction cross times straight pi over 180 space rad space

Distance space of space Jupiter space from space Earth comma space straight d space equals space 824.7 space cross times space 10 to the power of 9 space straight m space

So comma space diameter space of space Jupiter comma space straight D space equals space straight theta space cross times straight d space

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 1.73 space cross times space 10 to the power of negative 4 end exponent space cross times space 824.7 space cross times 10 to the power of 9 space

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 1.43 space cross times 10 to the power of 8 space straight m
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What is measurement?

Measurement is the process of attaching a numeric value to an aspect of a natural phenomenon. Measurement is making the quantitative knowledge of a physical quantity. 
1289 Views

Give four examples of physical quantities.

Examples of Physical quantitie are force, mass, density and power.
821 Views

Define unit.

The quantity used as a standard of measurement is called unit. 

Example: Unit of time is second. 

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What is the need of measurement?

To get the complete knowledge of any physical quantity, measurement is needed. Measurement of any physical quantity involves comparison with a certain basic, arbitrarily chosen, internationally accepted reference standard called unit. Knowledge without measurement is incomplete and unsatisfactory. 
825 Views

Define physical quantity.

 


A measurable quantity in terms of which laws of Physics can be expressed is called physical quantity.

The result of a measurement of a physical quantity is expressed by a number accompanied by a unit.


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