First slide

Dimensions of physical quantities

Question

Amount of solar energy received on the earth’s surface per unit area per unit time is defined as solar constant. Dimension of solar constant is :

Easy

A

$M L T^{- 2}$
B

$M^{2} L^{0} T^{- 1}$
C

$M L^{2} T^{- 2}$
D

$M L^{0} T^{- 3}$

Solution

Solar constant is defined as . Solar energy received on earth’s surface per unit Area per unit time
So it has dimensions of intensity $I = \frac{E}{tA} = \frac{{ML}^{2} T^{- 2}}{{TL}^{2}}$
Dimensions of solar constant = $M L^{0} T^{- 3}$

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