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Atoms and Nuclei question

2020 · 6 Sep · Shift 2 · Q53
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Atoms and Nuclei question

2020 · 6 Sep · Shift 2 · Q53

JEE MainPhysicsAtoms and NucleiMCQ+4 / −1
Given the masses of various atomic particles mp = 1.0072 u, mn = 1.0087 u, me = 0.000548 u, mv‾{m_{\overline v }}mv​= 0, md = 2.0141 u, where p ≡\equiv≡ proton, n ≡\equiv≡ neutron, e ≡\equiv≡ electron, v‾≡\overline v \equivv≡ antineutrino and d ≡\equiv≡ deuteron. Which of the following process is allowed by momentum and energy conservation?
  1. A
    n + n →\to→ deuterium atom (electron bound to the nucleus)
  2. B
    n + p →\to→ d + γ\gammaγ
  3. C
    p →\to→ n + e+ + v‾\overline vv
  4. D
    e+ + e- →γ\to \gamma→γ
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