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Wien's Displacement Law

AQA A-level PhysicsAstrophysicsLesson 12 of 24

The peak wavelength of a black-body curve, λmax, depends only on the temperature. Wien's displacement law states:

λmax T = 2.9 × 10-3 m K

where λmax is in metres and T is the absolute temperature in kelvin. So λmax is inversely proportional to T: doubling the temperature halves the peak wavelength.

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