A) 0
B) W
C) 4R
D) 5R
Correct Answer: B
Solution :
Resolving power \[\propto \frac{1}{\lambda }\] and \[\propto \frac{1}{\sqrt{v}}\] \[\therefore \] \[R\,.\,P\propto \sqrt{v}\] \[\Rightarrow \] \[{{(R\,.\,\,P)}_{2}}={{(R\,.\,P)}_{1}}\times \sqrt{\frac{80kV}{20kV}}\] \[=2{{(R\,.\,P)}_{1}}\]
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