Dual Nature of Radiation and Matter is a Class 12 Physics chapter that carries about 4.4% of the Physics questions in NEET. Practise it with 45 questions covering 2 topics, each with an explanation.
Sets of 15 questions that adapt to your level, with an explanation for every answer.
Across the 13 previous year papers, Dual Nature of Radiation and Matter had 26 questions, about 2.0 a year. The most in one paper was 3, in NEET 2025.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 2 |
| NEET 2025 | 3 |
| NEET 2024 | 2 |
| NEET 2023 | 2 |
| NEET 2022 | 2 |
| NEET 2021 | 2 |
| NEET 2020 | 2 |
| NEET 2019 | 1 |
| NEET 2018 | 2 |
| NEET 2017 | 2 |
| NEET 2016 | 2 |
| Re-AIPMT 2015 | 2 |
| AIPMT 2014 | 2 |
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
If the intensity of light above the threshold frequency is increased, the photoelectric current:
Answer: B. increases, but the maximum kinetic energy of electrons is unchanged
Why: More photons per second free more electrons, but the energy of each photon, and so K_max, depends only on the frequency.
The wave nature of matter, as proposed by de Broglie, is most easily observed for:
Answer: B. microscopic particles like electrons
Why: Since de Broglie wavelength λ=h/p is inversely proportional to momentum, it becomes significant only for very light, fast-moving particles like electrons — for macroscopic objects it's immeasurably small.
In the photoelectric effect, the maximum kinetic energy of the emitted electrons depends on:
Answer: B. the frequency of the incident light
Why: KE_max = hν − φ. Maximum kinetic energy depends on the frequency of light (and the work function), not on intensity.
The de Broglie wavelength of a moving particle is given by:
Answer: A. λ = h/p (Planck's constant / momentum)
Why: de Broglie proposed that every moving particle has an associated wavelength λ = h/p, where p is its momentum.
Light of photon energy 5 eV falls on a metal of work function 2 eV. The maximum kinetic energy of the emitted electrons is:
Answer: A. 3 eV
Why: Einstein's equation: K_max = hν − φ = 5 − 2 = 3 eV.
In the Davisson–Germer experiment, electrons accelerated through 54 V were diffracted. Their de Broglie wavelength was about:
Answer: D. 1.67 Å
Why: λ = 12.27/√54 ≈ 1.67 Å, which matched the spacing of nickel atoms.
The energy of a photon of wavelength 620 nm is about (hc = 1240 eV nm):
Answer: C. 2 eV
Why: E = hc/λ = 1240/620 = 2 eV.
Photoelectrons of maximum kinetic energy 4 eV are emitted. The de Broglie wavelength of the fastest electron is about:
Answer: B. 6.1 Å
Why: λ = 12.27/√4 = 6.1 Å.
Dual Nature of Radiation and Matter carries about 4.4% of the Physics questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 26 times, about 2.0 questions a year.
Dual Nature of Radiation and Matter is a Class 12 Physics chapter in the NCERT syllabus.
NeetVictory has 45 practice questions on Dual Nature of Radiation and Matter, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.
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