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NEET 2006
Exam
NEET
Year
2006
Subject
Physics
Chapter
Atomic Physics

NEET 2006 · Physics · Atomic Physics

Ionization potential of hydrogen atom is 13.6 eV . Hydrogen atoms...

Ionization potential of hydrogen atom is 13.6eV13.6 \mathrm{eV}. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1eV12.1 \mathrm{eV}. According to Bohr's theory, the spectral lines emitted by hydrogen will be:

Options

  1. Aone
  2. Btwo
  3. Cthree
  4. Dfour

Correct answer

C. three

Step-by-step solution

According to question 12.1=13.6(1l2−1n2)⇒n2=13.61.5=9⇒n=3\begin{aligned}& 12.1=13.6\left(\frac{1}{l^2}-\frac{1}{n^2}\right)\\ & \Rightarrow \quad n²=\frac{13.6}{1.5}=9 \\ & \Rightarrow \quad n=3 \\ & \end{aligned}Numberofspectrallinesemittedof spectral lines emitted=n(n−1)2=3×22=3\begin{aligned}& =\frac{n(n-1)}{2}=\frac{3 \times 2}{2}\\ & =3 \end{aligned}$
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