Exam-style question
Try this first
Using Wien's law, explain how the peak wavelength of radiation emitted by a star changes with its temperature.
Model answer
What a good answer should say
- Wien's law states that the peak wavelength (λ_max) is inversely proportional to the absolute temperature (T) of the black body, expressed as λ_max = b/T, where b is Wien's displacement constant (approximately 2.898 x 10^-3 m·K).
- As the temperature of the star increases, the peak wavelength decreases, meaning the star emits radiation at shorter wavelengths.
Explanation
Why this works
This answer demonstrates a clear understanding of Wien's law and its implications for stellar temperatures. It tests the student's ability to apply a specific law to explain physical phenomena, reinforcing the connection between temperature and radiation.
Common mistake
No common mistake is linked to this question yet.