A) 3000\[\overset{o}{\mathop{\text{A}}}\,\]
B) 3500 \[\overset{o}{\mathop{\text{A}}}\,\]
C) 4500 \[\overset{o}{\mathop{\text{A}}}\,\]
D) 5156 \[\overset{o}{\mathop{\text{A}}}\,\]
Correct Answer: D
Solution :
The work function of metal \[W=2.4\text{ }eV\] \[=2.4\times 1.6\times {{10}^{-19}}J\] Wavelength of photon \[=\frac{hc}{W}\] \[=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{2.4\times 1.6\times {{10}^{-19}}}\] \[=5.156\times {{10}^{-7}}m\] \[=5156\overset{o}{\mathop{\text{A}}}\,\]
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