Why light is a scalar quantity? Justify
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A quantity which does not depend on direction is called a scalar quantity. Vector quantities have two characteristics, a magnitude and a direction. Scalar quantities have only a magnitude. When comparing two vector quantities of the same type, you have to compare both the magnitude and the direction.
Explanation:
Electric current is a scalar quantity. ... In the case of electric current, when two currents meet at a junction, the resultant current of these will be an algebraic sum and not the vector sum. Therefore, an electric current is a scalar quantity although it possesses magnitude and direction.
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Light per se is not a scalar or a vector quantity. Light is a physical phenomenon. But among the diverse properties of light we have its speed and its velocity. Speed, usually denoted by the letter c, is a scalar quantity, but velocity is a vector quantity, that is: it has intensity (c=300 000 km/s) and direction. The second postulate of special relativity is a statement on the speed of light (the same for inertial observers) not velocity. Velocity must be treated with vector algebra methods; and it’s not the same for different inertial observers.
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