A) \[3000\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[3500\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[4500\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[5000\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: D
Solution :
Work function \[\phi =\frac{hc}{\lambda }\] \[\therefore \] \[\lambda =\frac{hc}{\phi }=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{2.4\times 1.6\times {{10}^{-19}}}=5000\overset{\text{o}}{\mathop{\text{A}}}\,\]
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