Question

Number of Joule in one calorie by method of dimensions with solution​

Answer 1

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1 cal = 4.184 J. 1 eV = 1.602 × 10−19 J.

@MissTranquillity

Answer 2

The use of units in a calculation to ensure that we obtain the final proper units is called dimensional analysis. For example, if we observe experimentally that an object’s potential energy is related to its mass, its height from the ground, and to a gravitational force, then when multiplied, the units of mass, height, and the force of gravity must give us units corresponding to those of energy.

Energy is typically measured in joules, calories, or electron volts (eV), defined by the following expressions:

1 J = 1 (kg·m2)/s2 = 1 coulomb·volt

1 cal = 4.184 J

1 eV = 1.602 × 10−19 J

Hope it helps you....