Question: The power density radiated by a star [Fig. E3.11(a)] decreases radially as S(R) = S0 / R2, where R is the radial distance from the

The power density radiated by a star [Fig. E3.11(a)] decreases radially as S(R) = S0 / R2, where R is the radial distance from the star and S0 is a constant. Recalling that the gradient of a scalar function denotes the maximum rate of change of that function per unit distance and the direction of the gradient is along the direction of maximum increase, generate an arrow representation of –½S.
(a)

(b)

7S Figure E3.11

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