The energy required to remove an electron from different subshells of a $H$ atom is given below. What is the order of these energies?

  • A
    $E_1 > E_2 > E_3$
  • B
    $E_3 > E_2 > E_1$
  • C
    $E_1 = E_2 = E_3$
  • D
    None of these

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