A) \[2900\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[2500\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[5380\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[1200\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: C
Solution :
Here: work function \[{{W}_{0}}=2.3\,eV=2.3\times 1.6\times {{10}^{-19}}J\] where \[{{\lambda }_{0}}\] is the threshold wavelength for sodium Then, \[{{W}_{0}}=\frac{hc}{{{\lambda }_{0}}}\] or \[{{\lambda }_{0}}=\frac{hc}{{{W}_{0}}}\] \[{{\lambda }_{0}}=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{2.3\times 1.6\times {{10}^{-19}}}\] \[=5380\times {{10}^{-10}}m\] \[=5380\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
You need to login to perform this action.
You will be redirected in
3 sec
