NEET 2023 Phase 1 · PhysicsSpectral seriesPrevious Year Question
In hydrogen spectrum, the shortest wavelength in the Balmer series is λ. The shortest wavelength in the Brackett series is:
Answer: (B) 4λ. Answer: (b) 4λ Solution: Shortest wavelength = series limit (n=∞).
- A.2λ
- B.4λ✓
- C.9λ
- D.16λ
Correct Answer
(B) 4λ
Solution & Explanation
Answer: (b) 4λ Solution: Shortest wavelength = series limit (n=∞). Balmer (∞→2): 1/λ = R/4 = R/2². Brackett (∞→4): 1/λ' = R/16 = R/4². Ratio λ'/λ = (1/λ)/(1/λ') = (R/4)/(R/16) = 4 → λ' = 4λ.
🎯
43,000+ questions in हिंदी & English · one-tap toggle
Open →📚Practice all NEET Physics PYQs chapter-wise →💡Don't get it? Learn the Atoms concepts →Practice NEET 2023 Phase 1 Physics — free, with instant solutions
43,000+ NEET questions solved step-by-step, chapter-wise, in the MedicNEET app.
More NEET PYQ solutions
PhysThe wavelength of Lyman series of hydrogen atom appears in:PhysThe ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is:PhysGiven the value of Rydberg constant is 10⁷ m⁻¹, the wave number of the last line of the Balmer series in hydrogen spectrum will be:PhysAn electric dipole with dipole moment 5 × 10⁻⁶ C·m is aligned with the direction of a uniform electric field of magnitude 4 × 10⁵ N/C. The dipole is then rotated through an angle of 60° with respect to the electric field. The change in the potential energy of the dipole is:PhysTwo identical charged conducting spheres A and B have their centres separated by a certain distance. Charge on each sphere is q and the force of repulsion between them is F. A third identical uncharged conducting sphere is brought in contact with sphere A first and then with B and finally removed from both. New force of repulsion between spheres A and B (radii negligible vs separation, treated as point charges) is best given as:PhysThe plates of a parallel plate capacitor are separated by d. Two slabs of different dielectric constant K1 and K2 with thickness 3d/8 and d/2 respectively are inserted in the capacitor. Due to this, the capacitance becomes two times larger than when there is nothing between the plates. If K1/K2 = 1.25, the value of K1 is:PhysA sphere of radius R is carved out of a uniform solid sphere of radius 2R (internally tangent, so its centre is at distance R from the big centre). The ratio of the moment of inertia of the small sphere to that of the remaining part, both about the Y-axis through the big sphere's centre, is:PhysThe Sun rotates once in 27 days. If it expanded to twice its present radius (uniform-density sphere, no external influence), its new period would be about: