When an electron in hydrogen in hydrogen atom is excited, from its 4th to 5th stationary orbit. The change in angular momentum of electron is: (Planck constant, h=6.6 × 10-34 Js )

Question

When an electron in hydrogen in hydrogen atom is excited, from its 4th to 5th stationary orbit. The change in angular momentum of electron is: (Planck constant, h=6.6 × 10-34 Js ) (A)  2.09 text Js  (B)  1.05× 10-34Js  (C)  3.32× 10-34Js  (D)  4.16× 10-34Js

Tardigrade Admin · Accepted Answer

Here: Number of initial orbit n1=4 Number of final orbit n2=5 Now change in angular momentum is given by Δ L=L2-L1=(n2h/2π )-(n1h/2π ) =(h/2π )( n2-n1 ) =(6.6× 10-34/2× 3.14)(5-4)=1.05× 10-34Js

Q. When an electron in hydrogen in hydrogen atom is excited, from its 4th to 5th stationary orbit. The change in angular momentum of electron is: (Planck constant, $h = 6.6 \times 10^{- 34} J s$ )

$2.09 J s$

$1.05 \times 10^{- 34} J s$

$3.32 \times 10^{- 34} J s$

$4.16 \times 10^{- 34} J s$

Q. When an electron in hydrogen in hydrogen atom is excited, from its 4th to 5th stationary orbit. The change in angular momentum of electron is: (Planck constant, h=6.6×10−34Js )

2.09Js

1.05×10−34Js

3.32×10−34Js

4.16×10−34Js

Here: Number of initial orbit n1​=4 Number of final orbit n2​=5 Now change in angular momentum is given by ΔL=L2​−L1​=2πn2​h​−2πn1​h​ =2πh​(n2​−n1​) =2×3.146.6×10−34​(5−4)=1.05×10−34Js

Q. When an electron in hydrogen in hydrogen atom is excited, from its 4th to 5th stationary orbit. The change in angular momentum of electron is: (Planck constant, $h = 6.6 \times 10^{- 34} J s$ )

$2.09 J s$

$1.05 \times 10^{- 34} J s$

$3.32 \times 10^{- 34} J s$

$4.16 \times 10^{- 34} J s$