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Joule is the unit of

Q. Joule is the unit of

 A   Temperature
 B   Pressure
 C   Energy
 D   Electric potential
Answer:-Energy
Explanation:  

Joule is the SI unit of work or energy, equal to the work done by a force of one newton when its point of application moves one metre in the direction of action of the force, equivalent to one 3600th of a watt-hour.

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The coefficient of reflectivity of a perfect black body is

The colour of light determined by its