Here, 25×43πr2=43πR3
⇒25×0.17×10-23=R3 ∴R=4.97×10-3
∴E=△A×T=4πNr2-R2×T
=4×3.1425×0.17×10-22-4.97×10-32×7.2×10-3
=4.3×10-6 J Ans.
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