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JEE Main 2022 (29 Jun, Shift 2) · Radioactive Decays: Alpha, Beta, Gamma

Radioactive Decays: Alpha, Beta, Gamma question from JEE Main 2022 (29 Jun, Shift 2)

Q15JEE Main 2022 · 29 JUN · SHIFT 2Easy

Radioactive Decays: Alpha, Beta, Gamma

In the following nuclear reaction,

D→αD1→β−D2→αD3→γD4D \xrightarrow{\alpha} D_{1} \xrightarrow{\beta^{-}} D_{2} \xrightarrow{\alpha} D_{3} \xrightarrow{\gamma} D_{4}

Mass number of D is 182 and atomic number is 74. Mass number and atomic number of D4 respectively will be _________.

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Answer: (a)

  1. α\alpha: (182,74)→(178,72)(182, 74) \to (178, 72)
  2. β−\beta^-: (178,73)(178, 73); α\alpha: (174,71)(174, 71)
  3. γ\gamma: no change, so D4D_4 is (174,71)(174, 71).
  4. So the answer is (a) 174 and 71.
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