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हाइड्रोजन परमाणु के द्वितीय बोर कक्षा का अर्द्धव्यास होगा ( प्लांक स्थिरांक h = 6.6262 x 10-34 Js; इलेक्ट्रॉन का द्रव्यमान = 9.1091 x 10-31 kg; इलेक्ट्रॉन का आवेश e 1.60210 × 10-19 C; निर्वात का परावैद्युतांक Eo = 8.854185 × 10-12 kg 1m3 A1/2 )

(a) 4.76 Å 

(b) 0.529 Å 

(c) 2.12 A 

(d) 1.65 Å

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