Chapter 16, Problem 30P

(a)

To determine

The land area in ${\text{km}}^2$ and ${\text{mi}}^2$ the solar collectors must occupy if they are photocells with $42\%$ efficiency.

(b)

To determine

The land area in ${\text{km}}^2$ and ${\text{mi}}^2$ the solar collectors must occupy if they are mirrors that generate steam for a turbine generator with $21\%$ efficiency.