The Planck distribution gives the energy in the wavelength range dA at the wavelength A. Calculate the

Question:

The Planck gives the energy in the wavelength range dA at the wavelength A. Calculate the energy density in the range 650 nm to 655 nm inside a cavity of volume 100 em3 when its temperature is
(a) 25°C,
(b) 3000°C Distribution
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