Consider a solar panel that is 12% efficient, and is exposed to 250 w/m2 of sunlight.

(a) what is the power output per square meter of the solar panel?

(b) assuming it takes approximately 2 x 109 joules of energy to manufacture 1 square meter of crystalline-silicon photovoltaic cell, what is the energy payback time for this type of solar panel if exposed to constant sunlight 24 hours/day?

d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]

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