What happens to the peak brightness wavelength of a black body as its temperature increases?

As the temperature of a black body increases, the peak brightness wavelength decreases. This phenomenon is described by Wien’s Displacement Law, which states that the wavelength at which the emission of a black body spectrum is at its maximum is inversely proportional to the absolute temperature of the body. Specifically, as the temperature rises, the peak wavelength shifts towards shorter wavelengths (higher frequencies).

For example, at lower temperatures, a black body may emit primarily in the infrared range, while at higher temperatures, it starts to emit visible light, shifting towards blue/violet wavelengths. Therefore, as you increase the temperature, you observe that the light emitted shifts from red to blue, indicating a decrease in wavelength. This fundamental principle is essential in astrophysics for understanding various phenomena related to stellar objects and thermal radiation.