When an electron in a hydrogen atom is excited from its $4^{th}$ to $5^{th}$ stationary orbit,the change in angular momentum of the electron is (Planck's constant: $h = 6.6 \times 10^{-34} \ J \cdot s$)
- A$4.16 \times 10^{-34} \ J \cdot s$
- B$3.32 \times 10^{-34} \ J \cdot s$
- C$1.05 \times 10^{-34} \ J \cdot s$
- D$2.08 \times 10^{-34} \ J \cdot s$
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