The Sun emits about 3.9×1026 J of electromagnetic radiation each second. Part A

Question

The Sun emits about 3.9×1026 J of electromagnetic radiation each second.

Part A

Estimate the power that each square meter of the Sun's surface radiates. The diameter of the Sun is about 1.4×109m.

Express your answer to two significant figures and include the appropriate units.

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Part B

Find the intensity at the distance of the Earth. The distance from the Earth to the Sun is about 1.5×1011m.

Express your answer to two significant figures and include the appropriate units.

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Explanation / Answer

power that each square meter of the Sun's surface radiates = radiation each second/ area of sun

area of sun = 4* 3.14*(0.7*10^9)^2

= 3.9*10^26/(4* 3.14*(0.7*10^9)^2) = 63369296.76 J/s per unit area

b)

intensity at r = Power/Area ( area at r = 4* 3.14*(1.5*10^11)^2 )

= 3.9*10^26/(4* 3.14*(1.5*10^11)^2) = 1380.04 J/s per unit area

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