JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 17 March 2021, Shift 1, Physics Q14

Question 14 of 90 in this shift, Physics question 14 of 30, Section A.

Which level of the single ionized carbon has the same energy as the ground state energy of hydrogen atom ?

(1)1
(2)4
(3)6Official answer
(4)8

Official answer

Option 3

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

7 Apr 2025, Shift 1 · Q44In a hydrogen like ion, the energy difference between the $2^{\mathrm{nd}}$ excitation energy state and ground is 108.8 eV. The atomic…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.