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Friday, 9 October

JEE Main 2017 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 2 April 2017 (offline), Physics Q25

Question 25 of 90 in this shift, Physics question 25 of 30.

Some energy levels of a molecule are shown in the figure. The ratio of the wavelengths r=λ1/λ2r=\lambda_1/\lambda_2, is given by :

The figure, in words

Energy level diagram with levels at -E, -4E/3 (dashed), -2E and -3E. Transition arrow lambda_2 goes from -E down to -4E/3; arrow lambda_1 goes from -E down to -2E.
  1. (1)r=43r=\frac{4}{3}
  2. (2)r=23r=\frac{2}{3}
  3. (3)r=34r=\frac{3}{4}
  4. (4)r=13r=\frac{1}{3}Official answer

Official answer

Option 4

CBSE answer key (25/04/2017, used for result).

Chapter
Atoms
Topic
Bohr's Atomic Model
Idea tested
Wavelengths in Cascade Transitions

Same topic in other shifts

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Question text from the official JEE Main paper published by NTA (CBSE ran the 2017 exam); answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.