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ICSE Class 10 Physics 2015 Paper

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An atomic nucleus AA is composed of 84 protons and 128 neutrons.
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Question : 73 of 74
Marks: +1, -0
The nucleus BB emits a beta particle and is transformed into a nucleus CC . What is the composition of nucleus CC ?
Solution:  
82208B→−β83208C+e−1∘_{82}^{208}\mathrm{B} \xrightarrow{-\beta} _{83}^{208}\mathrm{C}+e^{\circ}_{-1}
No. of protons in C=83C=83
No. of neutrons in C=208−83C=208-83
=125=125
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