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The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number Z of hydrogen like ion is
Options
(a) 3
(b) 4
(c) 1
(d) 2
Correct Answer:
2
Explanation:
For first line of Lyman series of hydrogen
hc/λ₁ = Rhc (1/1² – 1/2²)
For second line of Balmer series of hydrogen like on
hc/λ₂ = Z²Rhc (1/2² – 1/4²)
By eq. λ₁ = λ₂
(1/1 – 1/2) = Z² (1/4 – 1/16) or Z = 2
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The barrier potential of a p-n junction depends on
- The initial rate of increase of current, when a battery of emf 6 V is connected
- A particle moves along the x-axis from x=0 to x=5 m under the influence of a force
- An electric kettle takes 4A current at 220 V. How much time will it take to boil 1 kg
- The moon’s radius is 1/ 4 that of the earth and its mass is 1 / 80 times that of the earth
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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