The figure that is not a direct manifestation | vedclass

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(A) The quantum nature of atoms is demonstrated by phenomena where energy is quantized,such as the photoelectric effect,atomic spectra,and black-body

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(A) The quantum nature of atoms is demonstrated by phenomena where energy is quantized,such as the photoelectric effect,atomic spectra,and black-body radiation. $1$. The photoelectric effect (option $B$) shows that light interacts as discrete packets of energy (photons). $2$. Atomic spectra (option $C$) show that electrons in atoms occupy discrete energy levels. $3$. Black-body radiation (option $D$) shows that energy emission is quantized. However,the internal energy of a gas like $Ar$ (option $A$) increases continuously with temperature according to classical kinetic theory,which is a classical,not a quantum,manifestation. Therefore,the figure representing the internal energy of $Ar$ versus temperature is not a direct manifestation of the quantum nature of atoms.

The figure that is not a direct manifestation of the quantum nature of atoms is:

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