Consider the spectral emittance for radiation from a blackbody atT=1500 K. Take an oscillator that emit photons with a wavelengthof 5 micrometer and another oscillator that emit photons with awavelength 0.5 micrometer. Thermal energy ( in ev) at 1500 K isThe population ratio of the number of low-frequencyoscillator in the first excited state to that of theground state isThe population ratio of the number of high-frequencyocillator in the first excited state to that of theground state is

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Consider the spectral emittance for radiation from a blackbody at T=1500 K. Take an oscillator that emit photons with a wavelength of 5 micrometer and another oscillator that emit photons with a wavelength 0.5 micrometer.