AP Physics 2
15.4 Blackbody Radiation
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.
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?
| State | Radius | Peak 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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