ï»¿ It is a well known fact that during a total solar eclipse the disk of the moon almostÂ completely covers the disk of the Sun. From this fact and from the information youÂ can gather from examples 2.3 and 2.4, determine the approximate diameter of theÂ moon. from Physics Units and Measurement Class 11 Manipur Board

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Physics Part I

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It is a well known fact that during a total solar eclipse the disk of the moon almostÂ completely covers the disk of the Sun. From this fact and from the information youÂ can gather from examples 2.3 and 2.4, determine the approximate diameter of theÂ moon.

Distance of the Moon from the Earth = 3.84 Ã— 108Â mÂ

Distance of the Sun from the Earth = 1.496 Ã— 1011Â mÂ

Diameter of the Sun = 1.39 Ã— 109Â mÂ

During a lunar eclipse, the position of the sun, moon and earth is as shown below:

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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 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.
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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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Give four examples of physical quantities.

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