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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
- An ideal coil of 10 H is connected in series with a resistance of 5Ω and a battery
- If force(F),length(L) and time(T) be considered fundamental units, then the units of mass
- If a carnot engine is working with source temperature at 227⁰C and sink
- A bar magnet with magnetic moment 2.5×10³ JT⁻¹ is rotating in horizontal plane
- The mean distance between the atoms of iron is 3 x 10⁻¹⁰ m and interatomic force
Topics: Atoms and Nuclei (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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