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According to the black body radiation theory wavelength of light decreases with increase in temperature whereas the frequency increases.

The wavelength keeps decreasing till absolute hot where it becomes 0 and the frequency becomes infinite. Thus in the radiations emitted from such a body have no electric and magnetic fields oscillating and they become coincident along the direction of motion of radiation.

This makes sense as theories suggest that Electric & Magnetic fields were same at the beginning of the universe. Conversely if the first assumption is false then it means there is a maximum frequency and minimum wavelength of radiation possible beyond which we cannot go.

By the way I am just starting out. Please be merciful in explanations.

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    $\begingroup$ What is the question here? $\endgroup$ – Nihar Karve Feb 23 at 5:17
  • $\begingroup$ By "wavelength of light" do you mean "wavelength of peak intensity"? And by "absolute hot" do you mean $T\rightarrow\infty$? $\endgroup$ – garyp Feb 23 at 16:03
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In general, the limit of $T \rightarrow \infty$ is not as straightforward, because at some point the particles move so fast that we need to account for relativistic effects.

We often regard the Planck temperature of $T_\text{P} \approx 1.4 \cdot 10^{32}\,\text{K}$ as the hottest possible, according to our current understanding of the universe. A body with that temperature would have its radiation peak at a wavelength of around $1.6\cdot10^{−35}\,\text{m}$. In that sense, your assumption about the limit of the wavelength and frequency is wrong.

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