question_answer

In Rutherford's experiment, the number of \[\alpha \]- particles scattered through an angle of \[60{}^\circ \]by a silver foil is 200 per minute. When the silver foil is replaced by a copper foil of the same thickness, the number of \[\alpha \]-particles scattered through an angle of \[60{}^\circ \] per minute is:

A)  \[\frac{200\times {{Z}_{Cu}}}{{{Z}_{Ag}}}\]

B)  \[200\times {{\left( \frac{{{Z}_{Cu}}}{{{Z}_{Ag}}} \right)}^{2}}\]

C)  \[200\times \frac{{{Z}_{Cu}}}{{{Z}_{Ag}}}\]

D)  \[200\times {{\left( \frac{{{Z}_{Ag}}}{{{Z}_{Cu}}} \right)}^{2}}\]