Q38 / 201 · NTA Abhyas (NEET) 2020 · Physics · Atomic Physics

An electron with kinetic energy 10 eV is incident on a hydrogen atom in its ground state. The collision

  • Correct answer
    A
    Must be elastic
  • B
    May be partially elastic
  • C
    Must be completely inelastic
  • D
    May be completely inelastic

Solution

10 eV electron cannot excite a hydrogen atom Hence collision is elastic as minimum energy required to excite is 10.2 eV. so no change in total K.E of system is possible.

Hence, the correct answer is option: 'A'.

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