Skip to main content
Super TutorResources
Chapter 24 of 32
QuestionsNotesFlashcardsSummaryFormulasQuizConceptsSyllabusPlan
Important Questions

Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom

ICSE · Class 12 · Physics

Most important questions from Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom for ICSE Class 12 Physics board exam 2026. MCQs, short answer, and long answer questions with marks.

59 questions35 flashcards5 concepts

Interactive on Super Tutor

Studying Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for important questions and more.

Try Super Tutor — Free

1,000+ Class 12 students started this chapter today

59 Questions·
multiple choicemultiple correct

Sample Questions

1multiple choice
3 marks

In a hydrogen-like atom with atomic number Z = 3, what is the radius of the third orbit? Use rn = (0.53)n^2/Z Å.

Show answer

1.59 Å

Use rn = (0.53)n^2/Z Å. For n = 3 and Z = 3, r3 = 0.53 × 9 / 3 = 1.59 Å.

2multiple choice
3 marks

For hydrogen, what is the speed of the electron in the second Bohr orbit if the speed in the first orbit is c/137?

Show answer

c/274

The speed varies as 1/n. If the first-orbit speed is c/137, then for n = 2 it becomes (c/137)/2 = c/274.

3multiple choice
3 marks

The energy of an electron in the ground state of hydrogen is -13.6 eV. What is the total energy of the electron in the fourth orbit?

Show answer

-0.85 eV

For hydrogen, En = -13.6/n^2 eV. For n = 4, En = -13.6/16 = -0.85 eV.

4multiple choice
3 marks

A hydrogen atom changes from n = 4 to n = 1. What is the energy of the emitted photon?

Show answer

12.75 eV

Energy at n = 4 is -0.85 eV and at n = 1 is -13.6 eV. The emitted photon energy is the difference: -0.85 - (-13.6) = 12.75 eV.

+55 more questions available

Practice All

Frequently Asked Questions

What are the important topics in Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom for ICSE Class 12 Physics?
Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom covers several key topics that are frequently asked in ICSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom — ICSE Class 12 Physics?
Understand the core concepts first, then work through the 59 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom?
There are 59 practice questions available for Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom

All 32 chapters — ICSE Class 12 Physics Important Questions

For serious students

Get the full Atom, Origin of Spectra: Bohr's Theory of Hydrogen Atom chapter — for free.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan for ICSE Class 12 Physics.

Try Super Tutor Free
Try the full chapter — Free