A) Ultraviolet region
B) Visible region
C) X-ray region
D) y-ray region
Correct Answer: A
Solution :
From Plancks law, the energy is \[E=hv\] where v is frequency and h the Plancks constant. Also, \[1\,eV=1.6\times {{10}^{-19}}J\] \[\therefore \] \[v=\frac{E}{h}=\frac{14.4\times 1.6\times {{10}^{-19}}}{6.6\times {{10}^{-34}}}\] \[=3.4\times {{10}^{15}}Hz\] The range of frequency of ultraviolet rays varies from\[5\times {{10}^{7}}Hz\]to\[7\times {{10}^{14}}Hz\]. Hence, the given region belongs to ultraviolet region of electromagnetic spectrum.
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