Atomic Nucleus|. Practice MCQs Physics for Mdcat By Engr. Kamran Soomro | mosaicbro.com

Atomic Nucleus|. Practice MCQs Physics for Mdcat By Engr. Kamran Soomro

7 of 114 questions (Page 12 of 17)

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78 $\beta$-particle carries a charge:
Correct Answer: C
Explanation: Beta particles are electrons ($-e$) or positrons ($+e$); option c is correct for $\beta^-$.
79 When a radioactive nucleus emits a $\beta$-particle, the proton-neutron ratio:
Correct Answer: B
Explanation: $\beta^-$ decay converts a neutron to a proton, increasing $\frac{p}{n}$ ratio.
80 The reciprocal of decay constant of a radioactive element is called its:
Correct Answer: B
Explanation: Mean life ($\tau$) = $1/\lambda$, where $\lambda$ is the decay constant.
81 Nuclear reactions can be induced in $\text{Y}_2^{128}$ with the bombardment of:
Correct Answer: B
Explanation: Fast neutrons can induce nuclear reactions (e.g., fission or transmutation).
82 Electron was discovered by:
Correct Answer: A
Explanation: J.J. Thomson identified electrons in 1897.
83 Neutrons were discovered by bombarding alpha particles on:
Correct Answer: C
Explanation: Chadwick discovered neutrons by alpha bombardment of beryllium.
84 The phenomenon of spontaneous nuclear transformation accompanied by emission of energy is called:
Correct Answer: C
Explanation: Radioactivity involves spontaneous nuclear decay with energy release.
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