આલ્ફા કણ પ્રકીર્ણન પ્રયોગમાં, \(\alpha\) કણ માટે નજીક પહોંચવાનું અંતર \(4.5 \times 10^{-14} \mathrm{~m}\) છે. જો લક્ષ્ય ન્યુક્લિયસનો પરમાણુ ક્રમાંક \(80\) હોય, તો \(\alpha\)-કણનો મહત્તમ વેગ _______ \(\times 10^5\) \(\mathrm{m} / \mathrm{s}\) આશરે છે. \(\left(\frac{1}{4 \pi \epsilon_0}=9 \times 10^9 \mathrm{SI}\right.\) એકમ, \(\alpha\) કણનું દળ \(=\) \(\left.6.72 \times 10^{-27} \mathrm{~kg}\right)\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.