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  • A nuclear transformation is denoted by     <img alt="X ( n,\alpha) \Rightarrow \ _{3}^{7} {Li}" src="https://entrancecorner.oncodecogs.com/gif.latex?X%20%28%20n%2C%5Calpha%29%20%5CRi

A nuclear transformation is denoted by     X ( n,\alpha) \Rightarrow \ _{3}^{7} {Li}  Which of the following is the nucleus of element X ?

Option: 1

_{5}^{9}B


Option: 2

_{4}^{11}Be


Option: 3

_{6}^{12}C


Option: 4

_{5}^{10}B


Answers (1)

best_answer

As we learnt in

α -decay -

^{A}_{Z}X\rightarrow ^{A-4}_{Z-2}Y+^{4}_{2}He+Q

 

- wherein

Q\: value = \left ( M_{X} -M_{Y}-M_{He}\right )c^{2}

 

 The corresponding nuclear reaction is ^{A}_{z}X+^{1}_{0}n\rightarrow\ ^{7}_{3}Li+^{4}_{2}He

From conservation of atomic number z = 2 + 3 = 5

From conservation of mass, A + 1 = 4 + 7

Hence,  A = 10

So the element is ^{10}_{5}B.

The correct option is 4.

Posted by

jitender.kumar

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