A radioactive element $X$ emits six $\alpha$-particles and four $\beta$-particles leading to ond product ${ }_{82}^{208} Pb$. $X$ is

  • A

    ${ }_{92}^{238} U$ 

  • B

    ${ }_{90}^{230} Th$

  • C

    ${ }_{90}^{232} Th$

  • D

    ${ }_{92}^{239} U$

Similar Questions

The isotope ${ }_5^{12} \mathrm{~B}$ having a mass $12.014 \mathrm{u}$ undergoes $\beta$-decay to ${ }_6^{12} \mathrm{C} .{ }_6^{12 .}$ has an excited state of the nucleus $\left({ }_6^{12} \mathrm{C}^*\right)$ at $4.041 \mathrm{MeV}$ above its ground state. If ${ }_5^{12} \mathrm{~F}$ decays to ${ }_6^{12} \mathrm{C}^*$, the maximum kinetic energy of the $\beta$-particle in units of $\mathrm{MeV}$ is ( $1 \mathrm{u}=931.5 \mathrm{MeV} / c^2$, where $c$ is the speed of light in vacuum).

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In the nuclear reaction: $X(n,\,\alpha ){\,_3}L{i^7}$ the term $X$ will be 

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In which of the following decay, the element does not change

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