A) \[3.2\text{ }eV\]
B) \[7\,eV\]
C) \[1.55\text{ }eV\]
D) \[1\,eV\]
Correct Answer: C
Solution :
From Planck?s hypothesis, the energy of a photon, of frequency v is \[E=hv=\frac{hc}{\lambda }\] where c is speed of light and A-the wavelength. In the visible part, red colour has maximum wavelength \[\lambda =8000\overset{\text{o}}{\mathop{\text{A}}}\,\] \[\therefore \] \[E=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{8000\times {{10}^{-10}}\times 1.6\times {{10}^{-19}}}\] \[=1.547\,\,eV\]
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