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JEE Main 2025 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 7 April 2025, Shift 1, Physics Q44

Question 44 of 75 in this shift, Physics question 19 of 25, Section A.

In a hydrogen like ion, the energy difference between the

2^{\mathrm{nd}}

excitation energy state and ground is 108.8 eV. The atomic number of the ion is:

(1) $1$
(2) $3$ Official answer
(3) $2$
(4) $4$

Official answer

Option 2

NTA final key.

Chapter: Atoms
Topic: Bohr's Atomic Model
Idea tested: Scaling for Hydrogenic Ions

Same idea in other shifts

Asked 2× in all

17 Mar 2021, Shift 1 · Q14Which level of the single ionized carbon has the same energy as the ground state energy of hydrogen atom ?EasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.