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MHT CET 2023 (13 May, Shift 2) · Bohr Model: Orbits, Speed & Angular Momentum

Bohr Model: Orbits, Speed & Angular Momentum question from MHT CET 2023 (13 May, Shift 2)

Q58MHT CET 2023 · 13 MAY · SHIFT 2Easy

Bohr Model: Orbits, Speed & Angular Momentum

When an electron is excited from its 4 th orbit to 5 th stationary orbit, the change in the angular momentum of electron is approximately.

(Planck's constant =h=6.63×10−34 J-s= h = 6.63 \times 10^{-34}\text{ J-s})

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Answer: (c)

  1. ΔL=(5−4)h2π=h2π\Delta L = (5-4)\dfrac{h}{2\pi} = \dfrac{h}{2\pi}
  2. ΔL=6.63×10−342×3.14≈1.06×10−34\Delta L = \dfrac{6.63\times10^{-34}}{2\times3.14} \approx 1.06\times10^{-34} J s
  3. So the answer is (c) 1×10−341\times10^{-34} J s.
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