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The ratio of speed of an electron in ground state in Bohr’s first orbit of hydrogen atom to velocity of light in air (c ) is
Options
(a) e²/2ε₀hc
(b) 2e²ε₀/hc
(c) e³/2ε₀hc
(d) 2ε₀hc/e²
Correct Answer:
e²/2ε₀hc
Explanation:
Velocity of electron in nᵗʰ orbit = αcz / n
where α = (e²/4πε₀) [1 / c(h/π)] = e²/2ε₀hc
v / c = αz / n = (e² × 1) / 2ε₀hc × 1 = e²/2ε₀hc
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Topics: Atoms and Nuclei
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A particle free to move along X-axis has potential energy given as U(X) =k(1-e⁻ˣ²)
- A short magnet of magnetic moment M, is placed on a straight line. The ratio
- If by mistake voltmeter is connected in series and ammeter in parallel then
- A body takes 5 minute for cooling from 50⁰C to 40⁰C. Its temperature
- The voltage of an a.c.supply varies with time (t) as V=120 sin 100 πt the maximum voltage
Topics: Atoms and Nuclei (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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