AP EAMCET · PHYSICS · Atomic Physics

In hydrogen atom, if an electron in the orbit with principal quantum number ' \(n\) ' jumps to the first excited state, the wavelength of the emitted photon is ' \(\lambda\) '. Then the value of \(\mathrm{n}\) is
(R-Rydberg constant)

A \(\sqrt{\frac{4 \lambda R}{\lambda R+4}}\)
B \(\sqrt{\frac{4 \lambda R}{\lambda R-4}}\)
C \(\sqrt{\frac{\lambda \mathrm{R}-4}{4 \lambda \mathrm{R}}}\)
D \(\sqrt{\frac{\lambda \mathrm{R}+4}{4 \lambda \mathrm{R}}}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(\sqrt{\frac{4 \lambda R}{\lambda R-4}}\)

Step-by-step Solution

Detailed explanation

(When electron jump from \(\mathrm{n}_2=\mathrm{n}\) to first excited state…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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In hydrogen atom, if an electron in the orbit with principal quantum number ' \(n\) ' jumps to the first excited state, the wavelength of the emitted photon is ' \(\lambda\) '. Then the value of \(\mathrm{n}\) is(R-Rydberg constant)

Step-by-step Solution

In hydrogen atom, if an electron in the orbit with principal quantum number ' \(n\) ' jumps to the first excited state, the wavelength of the emitted photon is ' \(\lambda\) '. Then the value of \(\mathrm{n}\) is
(R-Rydberg constant)