science : रेडियो सक्रियता ( radio activity ) क्या होती है | chemistry | अल्फ़ा, बीटा, गामा क्या है?

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G sir ❤

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2

[@AmitKumar-wu8tz]

You tube per

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Yes sir

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Aapke charano mein lot pot ke pranam sir ji

[@umeshahirwar9294]

Namste sir ji 🙏🙏

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Hello sir je

[@AmitKumar-wu8tz]

Sir chemistry ka shabhi. Video daal digiye

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Hello sir

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Hai sir

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Hii

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1911 me

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Hy