The number of spectral lines emitted by atomic hydrogen that is in the $4^{\text {th }}$ energy level, is

The number of spectral lines emitted by atomic hydrogen that is in the $4^{\text {th }}$ energy level, is
  1. 3
  2. 1
  3. 6
  4. 0

Asked in: JEE Main 2025 (29 Jan Shift 2)

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