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Structure of Atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom1 Mark
MCQ
How many lines does a spectrum contain in an electronic transition from $n = 1$ to $n = 5$ in hydrogen atom?
  • ✓
    $10$
  • B
    $8$
  • C
    $1$
  • D
    $5$
✓

Answer

Correct option: A.
$10$
The no. of spectral lines produced in a spectrum $=\frac{(\text{n}_2-\text{n}_1)(\text{n}_2-\text{n}_1+1)}{2}$
Given that $\ce{n_2 = 5}$ and $\ce{n_1​= 1}$ ; the no. of spectral lines $=\frac{4\times5}{2}$
$= 10.$

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