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What is the angular momentum of an electron of a Li-atom in the n=5 orbit?

Asked in GSEB Board March 2019 · Bohr's rules in other systems

• (1) 6.625×10⁻³⁴ J s
• (2) 5.27×10⁻³⁴ J s
• (3) 1.325×10⁻³⁴ J s
• (4) 16.56×10⁻³⁴ J s

Step-by-step solution

Why the other options are wrong

• (1) 6.625×10⁻³⁴ J s is Planck's constant h on its own. No single slip reaches it from (5h)/(2π): it drops both the n=5 and the 2π.
• (3) 1.325×10⁻³⁴ J s is h/5: it divides by n where Bohr's rule multiplies by it.
• (4) 16.56×10⁻³⁴ J s is (5h)/2: the π in (nh)/(2π) has been left out.

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