The transition from the state $n = 3$ to $n = 1$ in a hydrogen-like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from

  • A
    $4 \to 2$
  • B
    $4 \to 3$
  • C
    $2 \to 1$
  • D
    $3 \to 2$

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