A) \[1000\overset{o}{\mathop{\text{A}}}\,\]
B) \[2000\overset{o}{\mathop{\text{A}}}\,\]
C) \[2955\overset{o}{\mathop{\text{A}}}\,\]
D) \[4200\overset{o}{\mathop{\text{A}}}\,\]
Correct Answer: C
Solution :
Using the relation \[W=\frac{hc}{\lambda }\]so, \[\lambda =\frac{hc}{W}\] Or \[\lambda =\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{4.2\times 1.6\times {{10}^{-19}}}=2955\overset{o}{\mathop{\text{A}}}\,\]
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