A) \[10\,\overset{o}{\mathop{A}}\,\,\,\,to\,\,100\overset{o}{\mathop{A}}\,\]
B) \[4,000\,\overset{o}{\mathop{A}}\,\,\,\,to\,\,\,8,000\overset{o}{\mathop{A}}\,\]
C) \[8,000\,\overset{o}{\mathop{A}}\,\,\,\,to\,\,10,000\overset{o}{\mathop{A}}\,\]
D) \[10,000\,\overset{o}{\mathop{A}}\,\,\,\,to\,\,15,000\overset{o}{\mathop{A}}\,\]
Correct Answer: B
Solution :
[b] Wavelength of visible spectrum is \[3900\overset{o}{\mathop{A}}\,-7800\overset{o}{\mathop{A}}\,\]
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