A) 22.4 V
B) 33 V
C) 66 V
D) 198 V
Correct Answer: B
Solution :
The equation for photoelectric effect given by Einstein is expressed as \[{{E}_{K}}=hv-W\] or \[hv=h{{v}_{o}}+e{{V}_{o}}\] Given: \[{{v}_{o}}=4.8\times {{10}^{16}}Hz,v=5.6\times {{10}^{16}}Hz,\] \[h=6.6\times {{10}^{-34}}Js,e=1.6\times {{10}^{-19}}C.\] \[6.6\times {{10}^{-34}}\times 5.6\times {{10}^{16}}\] \[=6.6\times {{10}^{-34}}\times 4.8\times {{10}^{16}}+{{V}_{0}}\times 1.6\times {{10}^{-19}}\] \[36.96\times {{10}^{-18}}\] \[=31.68\times {{10}^{-18}}+{{V}_{0}}\times 1.6\times {{10}^{-19}}\] \[{{V}_{0}}=\frac{36.96\times {{10}^{-18}}-31.68\times {{10}^{-18}}}{1.6\times {{10}^{-19}}}\] \[=\frac{523\times {{10}^{-18}}}{1.6\times {{10}^{-19}}}\] \[=3.3\times {{10}^{19}}\times {{10}^{-18}}=3.3\times 10=33\,\text{volt}\]You need to login to perform this action.
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