Atoms And Nuclei Question 431

Question: When an electron in hydrogen atom is excited, from its 4th to 5th stationary orbit, the change in angular momentum of electron is (Planck’s constant: h=6.6×1034J-s

Options:

A) 4.16×1034,J-s

B) 3.32×1034,J-s

C) 1.05×1034,J-s

D) 2.08×1034,J-s

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Answer:

Correct Answer: C

Solution:

  • Change in the angular momentum

    ΔL=L2L1=n2h2πn1h2π

    ΔL=h2π(n2n1) =6.6×10342×3.14(54) =1.05×1034J-S



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