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For gamma rays, it's by definition. Gamma rays are emitted from nuclear decay events, so even if a black body were to emit a photon with the same frequency as a gamma ray, it wouldn't be a gamma ray.

X-rays, though... at the high frequency end of the spectrum, the intensity of the radiation emitted is proportional to e-v. Since v (which should really be a Greek nu) for X-rays starts at around 3x1016, e-v is a very very small number indeed.

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Q: Why x ray or gamma ray are not emitted from blackbody spectrum?
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