Nuclear Radiation | Practice MCQs Physics for Mdcat By Engr Kamran Soomro | mosaicbro.com

Nuclear Radiation | Practice MCQs Physics for Mdcat By Engr Kamran Soomro

7 of 83 questions (Page 7 of 12)

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43 44. Pair production can take place only with:
Correct Answer: C
Explanation: Requires photon energy ≥1.02 MeV (typically $\gamma$-rays).
44 45. Beta particles are much less ionizing than alpha particles because of:
Correct Answer: C
Explanation: Lower charge ($-e$) and higher speed reduce ionization.
45 46. Pair production can not take place in vacuum as:
Correct Answer: C
Explanation: A nearby nucleus is needed to conserve momentum.
46 47. $\beta$-particles posses greater penetration power than that of $\alpha$-particles duet to its:
Correct Answer: A
Explanation: Lower ionization enables deeper penetration.
47 48. The process of making the gas non-conducting immediately after the passage of ionizing particle through the tube is called:
Correct Answer: C
Explanation: Quenching prevents continuous discharge in Geiger tubes.
48 49. $\gamma$-rays lose their energy by:
Correct Answer: D
Explanation: All three mechanisms contribute to energy loss.
49 50. Alpha particles are highly ionizing because of:
Correct Answer: A
Explanation: $+2e$ charge and slow speed maximize Coulomb interactions.
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