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Atoms — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsAtoms1 Mark
Question
For question two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.

  1. Both A and R are true, and R is the correct explanation of A.
  2. Both A and R are true, but R is NOT the correct explanation of A.
  3. A is true, but R is false.
  4. A is false and R is also false.

Assertion (A): It is essential that all the lines available in the emission spectrum will not be available in the absorption spectrum.

Reason (R): The spectrum of hydrogen atom is only absorption spectrum

✓

Answer

  1. A is true, but R is false.

Explanation:

Emission transitions can take place between any higher energy level and any energy level below it, while absorption transitions start from the lowest energy level only and may end at any higher energy level. Hence, number of absorptions transitions between two given energy levels is always less than the number of emission transitions between same two levels.

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