Dual Nature of Radiation and Matter: Class 12 Physics (CBSE) important questions and practice
Dual Nature of Radiation and Matter is chapter 11 of 14 in CBSE Class 12 Physics. Below are the topics the paper draws from, the question types that come up again and again, and a free practice test on this chapter alone.
Topics in this chapter
- Electron emission: thermionic, field, photoelectric
- Photoelectric effect: Hertz and Lenard's observations
- Experimental study: effect of intensity, potential and frequency; stopping potential and threshold frequency
- Einstein's photoelectric equation and the particle nature of light
- Wave nature of matter: de Broglie wavelength
- Davisson-Germer experiment (removed in CBSE)
What examiners usually ask
- Write Einstein's photoelectric equation and explain how it accounts for the existence of threshold frequency and the independence of KE from intensity
- Light of wavelength 400 nm falls on a metal of work function 2.0 eV; find the maximum kinetic energy of the emitted electrons and the stopping potential
- Derive the expression for the de Broglie wavelength of an electron accelerated through a potential V
Exam tip
Draw the three graphs (photocurrent vs intensity, photocurrent vs potential for different intensities and frequencies, stopping potential vs frequency) and know that the slope of the last gives h/e; the de Broglie formula lambda = 1.227/root V nm is a standard numerical.
Dual Nature of Radiation and Matter on other boards and exams
Frequently asked questions
What are the important questions from Dual Nature of Radiation and Matter for CBSE Class 12?
The question types listed above repeat most often in CBSE Class 12 Physics papers for this chapter. Practise them with the chapter test and then attempt them inside a full previous-year paper under time.
Is Dual Nature of Radiation and Matter in the CBSE Class 12 Physics syllabus?
Yes. Dual Nature of Radiation and Matter is part of the current CBSE Class 12 Physics syllabus, as listed on this site from the prescribed textbook.
Can I practise Dual Nature of Radiation and Matter MCQs in Hindi?
Yes. The chapter test and explanations are available in Hindi and English, with an AI doubt solver for any question.