A hydrogen atom in its ground state absorbs 10.2 eV of energy. The orbital angular momentum is increased by

(a) 1.05×10-34 J-sec                 (b) 3.16×10-34 J-sec
(c) 2.11×10-34 J-sec                 (d) 4.22×10-34J-sec
(Given Planck constant h = 6.6×10-34 J-sec)

(a) Electron after absorbing 10.2 eV energy goes to its first excited state (n=2) from ground state (n = 1).
 Increase in momentum = h2π

6.6×10-346.28=1.05×10-34 J-s
.

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