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AP Physics 2
15.4 Blackbody Radiation
AdvancedMCQMathematicalProportional Analysis25k
A model of a contracting spherical protostar treats it as an ideal blackbody radiator. The table below shows the radius R and peak emission wavelength \(\lambda_{\text{max}}\) of the protostar at three different evolutionary states.

StateRadiusPeak Emission Wavelength
1\(R_0\)\(\lambda_0\)
2\(\dfrac{1}{2}R_0\)\(\dfrac{1}{2}\lambda_0\)
3\(\dfrac{1}{4}R_0\)\(\dfrac{1}{2}\lambda_0\)

Which of the following gives the correct proportional dependence of the total radiated power P on radius R and peak wavelength \(\lambda_{\text{max}}\), and correctly ranks the total radiated powers \(P_1\), \(P_2\), and \(P_3\) for the three states?

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