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जब तीन α -कण जुड़कर कार्बन नाभिक 6C12  बनाते हैं तो उत्पन्न ऊर्जा की गणना कीजिए। 2He4 को परमाणु द्रव्यमान 4.002803 amu है।

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कार्बन नाभिक 6C12  का द्रव्यमान = 12u 

अभिक्रिया 3 ( 2He4 )- 6C12  में निर्गत् ऊर्जा 

= [3m (2He4)- m (6C12)] c

= [3 x 4.002603u – 12u] (931 MeV/4) 

= 7.27 MeV/u

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