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| $A$. चैडविक | $1$. कैथोड किरणें |
| $B$. रदरफोर्ड | $2$. $X$-रे स्पेक्ट्रा |
| $C$. मोजले | $3$. न्यूट्रॉन की खोज |
| $D$. जे. जे. थॉमसन | $4$. परमाणु का नाभिकीय मॉडल |
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