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 of 67

Marks: +1, -0

The nucleus B emits a beta particle and is transformed into a nucleus

C

. What is the composition of

C

Solution:

{ }_{82} {\B}^{208} {────▸}↖{-β}{ }_{83} {\C}^{208}+{ }_{-1} {\e}^0

∴ {\C}

is composed by 83 protons and 125 (i.e.,

208-83

) neutrons.

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