﻿ A new unit of length is chosen such that the speed of light in vacuum is unity. Whatis the distance between the Sun and the Earth in terms of the new unit if light takes8 min and 20 s to cover this distance ? from Physics Units and Measurement Class 11 Manipur Board

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A new unit of length is chosen such that the speed of light in vacuum is unity. What
is the distance between the Sun and the Earth in terms of the new unit if light takes
8 min and 20 s to cover this distance ?

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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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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.
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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

Define unit.

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

Example: Unit of time is second.

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Give four examples of physical quantities.

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