ICSE Class 10 Physics 2020 Solved Paper

An atomic nucleus A is composed of 84 protons and 128 neutrons. The nucleus A emits an alpha particle and is transformed into a nucleus B.

Question : 65

Total: 67

The nucleus B emits a beta particle and is transformed into a nucleus C . What is the composition of C ?

Solution:

‌82B208

−β

────▸

‌83C208+‌−1e0
∴C is composed by 83 protons and 125 (i.e., 208−83 ) neutrons.

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