Dual Nature of Radiation and Matter: The Exact Questions RBSE Keeps Asking (Chapter 11)

If you have gone through the last decade of RBSE Class 12 Physics papers, you will notice Chapter 11 (Dual Nature of Radiation and Matter) is tested every year without fail. It belongs to Unit VII — Dual Nature of Radiation and Matter and is drawn from a pool of 39 previous-year questions spanning 2013–2026, spread across MCQs, very short, short and long-answer sections. The topics rotate, but the question patterns stay remarkably steady.

Expect 0.5 to 1-mark openers on stopping potential, work function or de Broglie wavelength calculations. The 1.5-mark questions lean on Einstein's photoelectric equation and the wave-theory limitations of the photoelectric effect. The heavy marks sit in the 3-mark long answers, which ask you to derive the stopping-potential–frequency relation or describe the photoelectric experimental setup.

So the smart way to revise this chapter is not to read it end to end, but to practise the questions RBSE actually repeats. The five questions above — and the ten in the free sample PDF — are taken straight from real board papers and tagged with the exact years they appeared, so you can see for yourself what the full RBSE Physics chapterwise PYQ book offers before you decide to buy it.