A nucleus {}₈4}{X}²02} of an element emits ... - ICSE Class 10 ...

ICSE Class 10 Physics 2020 Paper

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Question : 24 of 67

Marks: +1, -0

A nucleus

{}_{84}\mathrm{X}^{202}

of an element emits an alpha particle followed by a beta particle. The final nucleus is

Y^{b}

. Find

a

and

b

.

Solution:

\;{}_{84}\mathrm{X}^{202} \xrightarrow{-\alpha} {}_{82}\mathrm{P}^{198} + {}_{2}^{4}\mathrm{He}

\;{}_{82}\mathrm{P}^{198} \xrightarrow{-\beta} {}_{83}\mathrm{Y}^{198} + {}_{-1}^{0}\mathrm{e}

Comparing

{}_{a}\mathrm{Y}^{b}

and

{}_{83}\mathrm{Y}^{198}

; We get

a=83

and

b=198

.

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