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The peak of the Sun's energy distribution spectrum occurs at 4753 angstrom when its temperature is 6050 K. What is the temperature of a star whose energy distribution peaks at 9506 angstrom?

1. 3025 K
2. 6050 K
3. 1512 K
4. 12100 K

Correct answer: 3025 K

Solution

By Wien's law lambda_max*T is constant, so doubling the peak wavelength (4753 -> 9506) halves the temperature: T = 6050/2 = 3025 K.

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