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The terminology of different parts of the electromagnetic spectrum is given in the text. Use the formula $\mathrm{E}=\mathrm{h} \boldsymbol{2}$ (for energy of a quantum of radiation: photon) and obtain the photon energy in units of $\mathrm{eV}$ for different parts of the electromagnetic spectrum. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation?
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Formula is, $\mathrm{E}=\mathrm{h} v \mathrm{~J}=\frac{\mathrm{h} v}{1,6 \times 10^{-19}} \mathrm{eV}$,
For radio waves, $\lambda=1 \mathrm{~m}$
Photon energy $=12.375 \times 10^{-7} \mathrm{eV}$
These energy values are related with spacing between energy levels of their sources.

For radio waves, $\lambda=1 \mathrm{~m}$
Photon energy $=12.375 \times 10^{-7} \mathrm{eV}$
These energy values are related with spacing between energy levels of their sources.

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