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Hydrogen atom in ground state is excited by a monochrmatic radiation of λ=975 Å. Number of spectral lines in the resulting spectrum emitted will be
Options
(a) 3
(b) 2
(c) 6
(d) 10
Correct Answer:
6
Explanation:
For the λ=975 Å
1 / λ = R [(1/n₁²) – (1/n₂²)]
where R is the Rydberg constant
Solving we get n₂ = n = 4 (Since, n₁ = 1 ground state)
Therefore number of spectral lines = n(n – 1) / 2 = 4(4 – 1) / 2 = 6.
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Light with an energy flux of 25×10⁴ Wm⁻² falls on a perfectly reflecting surface
- An isolated sphere has a capacitance of 50pF. What would be the radius of the sphere?
- A body is thrown with a velocity of 9.8 m/s making angle of 30° with the horizontal
- Length of a string tied to two rigid supports is 40 cm. Maximum length
- The masses of two radioactive substances are same and their half lives
Topics: Atoms and Nuclei (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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