A) 1 : 2
B) 1 : 1
C) 1 : 5
D) 1 : 4
Correct Answer: A
Solution :
Kinetic energy \[KE=\phi -{{\phi }_{0}}\] Here, \[K{{E}_{1}}=1-0.5=0.5eV\] \[K{{E}_{2}}=2.5-0.5=2eV\] \[\therefore \] \[\frac{K{{E}_{1}}}{K{{E}_{2}}}=\frac{0.5}{2}=\frac{1}{4}\] or \[\frac{v_{1}^{2}}{v_{2}^{2}}=\frac{1}{4}\] or \[\frac{{{v}_{1}}}{{{v}_{2}}}=\sqrt{\frac{1}{4}}=\frac{1}{2}\]You need to login to perform this action.
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