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In a radioactive series \( ^{235} _{92}L \to ^{235} _{92}M \to ^{231} _{90}N \to ^{231}...

Physics
JAMB 1982

In a radioactive series

\( ^{235} _{92}L \to ^{235} _{92}M \to ^{231} _{90}N \to ^{231} _{91}\phi \)

The particles emitted are respectively

  • A. \( \beta , \beta , \alpha \)
  • B. \( \alpha , \gamma , \beta \)
  • C. \( \gamma , \alpha , \beta \)
  • D. \( \alpha , \alpha , \beta \)
  • E. \( \beta , \alpha , \beta \)
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Correct Answer: Option C
Explanation

From L → M ⇒ No change in both mass and atomic number, meaning a gamma ray was released

From M → L ⇒ Change in both mass and atomic number, meaning an alpha particle was released

From L → \(\phi\) Change in atomic number only, meaning a beta particle was released


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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076
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WAEC offline past questions - with all answers and explanations in one app - Download for free
Post UTME Past Questions Agent
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Post UTME Past Questions Agent
WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076