Class 12 Physics — Chapter 11: Dual Nature of Radiation and Matter
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Practise Class 12 Physics Chapter 11, "Dual Nature of Radiation and Matter", with 90 NCERT-aligned multiple-choice questions. The set is split into 30 Easy, 30 Medium and 30 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"Dual Nature of Radiation and Matter" is one of the chapters where numerical problem-solving, derivations and conceptual application really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Dual Nature of Radiation and Matter, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 12 Physics mastery score. A few sample questions are shown below; sign in free to practise all 90.
Key concepts: Dual Nature of Radiation and Matter (Class 12 Physics)
This chapter covers the photoelectric effect, Einstein's photon theory, and the de Broglie wave nature of matter.
- Photoelectric effect
- Light ejects electrons from a metal only above a threshold frequency, instantaneously, with kinetic energy independent of intensity.
- Photon theory
- Light comes in quanta (photons) of energy E = hν; this explained the photoelectric effect, which the wave theory could not.
- Work function
- The minimum energy φ₀ to eject an electron; Einstein's equation: KE_max = hν − φ₀.
- Stopping potential
- The reverse voltage that just stops the fastest electrons: eV₀ = KE_max; depends on frequency, not intensity.
- de Broglie wavelength
- Matter has wave nature with λ = h/p = h/mv; significant for small particles like electrons.
Key formulas — Dual Nature of Radiation and Matter
💡 Exam tips for Dual Nature of Radiation and Matter
- Increasing intensity raises the NUMBER of photoelectrons, not their maximum kinetic energy — only frequency does that.
- Below the threshold frequency, no electrons are emitted however intense the light.
Sample questions
Photoelectric effect Nobel went to:
1921 Physics Nobel.
Below threshold frequency, photoelectrons:
Energy of photon < work function.
Photons of energies 4 eV and 6 eV on metal of φ = 2 eV. Ratio of KE_max values:
(4−2):(6−2) = 2:4 = 1:2.
Dual Nature of Radiation and Matter — FAQs
What are the key concepts in Class 12 Physics Dual Nature of Radiation and Matter?+
This chapter covers the photoelectric effect, Einstein's photon theory, and the de Broglie wave nature of matter. Key ideas include Photoelectric effect, Photon theory, Work function, Stopping potential, de Broglie wavelength.
What does Class 12 Physics Chapter 11 (Dual Nature of Radiation and Matter) cover on XamBaaz?+
It covers 90 NCERT-aligned MCQs on "Dual Nature of Radiation and Matter" — 30 Easy, 30 Medium and 30 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "Dual Nature of Radiation and Matter" questions free to practise?+
Yes — sign in with Google to practise "Dual Nature of Radiation and Matter" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Dual Nature of Radiation and Matter" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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