Then, using a and b can give an exact definition to the blackbody. In addition, the monochromatic radiant emittance of λ ηs and λ ηl at any temperature can be obtained from the right side of Eq. Therefore, the data in Table 1 is already enough to be used in general conditions, and may also be used as a manual text to plot the other spectrum curves. (6), using the unknown of η in Table 1 to get a curve. It should be noted that it will spend considerable software resources and time to solve Eq. 3 at different temperature can be obtained as well, which are the normalized spectrum curve of the blackbody thermal radiation presented in this paper. Then, using Table 2 can yield the η-λ curve 4 in Fig. For example, when T = 1000 K, substituting any values of x ηs and x ηl, which correspond to a certain value of η in Table 1, into Eqs (9) and ( 10) can obtain the values of λ ηs and λ ηl in Table 2. (9) and ( 10), then the relationship at this temperature of η with λ results. The short wave edge λ ηs and long wave edge λ ηl, sitting on the both sides of the curve’s peak, can be obtained from Eqs. For a given Kelvin temperature T and under the condition of η equal to 1 in Table 1, the substitution of the x m into (11) can lead to the same peak wavelength λ m of Eq.
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