Answer:
1. Thermal energy of air molecule at room
temp.
=
\[\frac{3}{2}kT=\frac{3}{2}\times 1.38\times
{{10}^{-23}}\times 300=621\times {{10}^{-21}}J=\frac{6.21\times {{10}^{-21}}}{1.6\times
{{10}^{-19}}}=0.039eV\]
\[\therefore\]
Thermal energy of air molecule at room temp.
\[\approx
0.0\text{2 eV}\]
.
2. Binding energy of heavy nuclei per nucleon is of the order of 7
MeV.
3. As X-rays are produced by potential diff. of the order of
kilovolts across the X-ray tube, therefore, X-ray photon energy is of the order
of 1 keV.
4. Photon energy of visible light comes from de-excitation of
atoms-which are ionised by a few eV. Therefore, this energy is of the order of
2 eV.
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