A) Only one \[-13.6\ eV\] or \[\gamma \]at a time
B) All the three \[_{92}{{U}^{238}}\] and \[\gamma \] one after another
C) All the three \[\alpha ,\ \beta \] and \[\gamma \] simultaneously
D) Only\[\alpha \] and \[\beta \] simultaneously
Correct Answer: A
Solution :
[a] No radioactive substance emit both \[\alpha \]and \[\beta \]particles simultaneously. Some substances emit \[\alpha -\]particles and some other emits \[\beta -\]particles. \[\gamma -\]rays are emitted along with both \[\alpha \]and\[\frac{4E}{3}-E=\frac{hc}{\lambda '}\Rightarrow \frac{E}{3}=\frac{hc}{\lambda '}\ \ \therefore \frac{\lambda '}{\lambda }=3\Rightarrow \lambda '=3\lambda \]particles.
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