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Dual Nature of Radiation and Matter

CBSE Class 12 · Physics · 33 past questions

  1. Q1 2026
    Radiation of wavelength 200 nm is incident on a photosensitive surface of work function 4·2 eV. The kinetic…
  2. Q2 2026
    A proton and an alpha particle have equal momentum. The ratio of their kinetic energies (E_p/E_a) and de…
  3. Q3 2026
    Questions number 13 to 16 are Assertion (A) and Reason (R) type questions. Two statements are given — one…
  4. Q4 2026
    A particle of mass M at rest splits up into two particles of masses $m_1$ and $m_2$ having non-zero…
  5. Q5 2026
    For question number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled…
  6. Q6 2026
    In a photoelectric experiment, the emitter plate is irradiated with radiation of 200 nm. The photocurrent…
  7. Q7 2026
    A researcher performs an experiment on photo-electric effect using two metals A and B with unknown work… (with a figure)
  8. Q8 2026
    The maximum kinetic energy of the electrons emitted from a photo sensitive surface depends on
  9. Q9 2026
    Note : For question numbers 13 to 16, two statements are given – one labelled as Assertion (A) and the other…
  10. Q10 2026
    Find ratio ($\lambda_a/\lambda_p$) of the de Broglie wavelength $\lambda_a$ and $\lambda_p$ associated…
  11. Q11 2025
    Choose the correct statement…
  12. Q12 2025
    A beam of red light and a beam of blue light have equal intensities. Which of the following statements is…
  13. Q13 2025
    Questions number 13 to 16 are Assertion (A) and Reason (R) type questions. Two statements are given — one…
  14. Q14 2025
    Atomic spectral emission lines of hydrogen atom are incident on a zinc surface. The lines which can emit…
  15. Q15 2025
    A light of wavelength 400 nm is incident on metal surface whose work function is $3.0 \times 10^{-19}$ J.…
  16. Q16 2025
    The stopping potential $V_0$ measured in a photoelectric experiment for a metal surface is plotted against…
  17. Q17 2025
    Let $\lambda_e$, $\lambda_p$ and $\lambda_d$ be the wavelengths associated with an electron, a proton and a…
  18. Q18 2024
    Which one of the following is the correct graph between the maximum kinetic energy ($K_m$) of the emitted… (with a figure)
  19. Q19 2024
    Questions number 13 to 16 are Assertion (A) and Reason (R) type questions. Two statements are given — one…
  20. Q20 2024
    The minimum intensity of white light that our eyes can perceive is about $0.1\ \text{nWm}^{-2}$. Calculate…
  21. Q21 2024
    Two beams, A and B whose photon energies are 3.3 eV and 11.3 eV respectively, illuminate a metallic surface…
  22. Q22 2024
    The waves associated with a moving electron and a moving proton have the same wavelength $\lambda$. It…
  23. Q23 2024
    Questions number 13 to 16 are Assertion (A) and Reason (R) type questions. Two statements are given — one…
  24. Q24 2024
    Consider a neutron (mass $m$) of kinetic energy $E$ and a photon of the same energy. Let $\lambda_n$ and…
  25. Q25 2024
    The work function for a photosensitive surface is 3·315 eV. The cut-off wavelength for photoemission of…
  26. Q26 2024
    Questions number 13 to 16 are Assertion (A) and Reason (R) type questions. Two statements are given — one…
  27. Q27 2024
    de Broglie wavelength λ as a function of $\frac{1}{\sqrt{K}}$, for two particles of masses m₁ and m₂ are… (with a figure)
  28. Q28 2023
    Which one of the following metals does not exhibit emission of electrons from its surface when irradiated by…
  29. Q29 2023
    Figure shows the variation of photoelectric current measured in a photo cell circuit as a function of the… (with a figure)
  30. Q30 2023
    Light of frequency $6{\cdot}4 \times 10^{14}$ Hz is incident on a metal of work function $2{\cdot}14$ eV. The…
  31. Q31 2023
    Calculate the wavelength of de Broglie waves associated with a proton having…
  32. Q32 2023
    Questions number 16 to 18 are Assertion (A) and Reason (R) type questions. Two statements are given — one…
  33. Q33 2022
    Name the spectral series for a hydrogen atom which lies in the visible region. Find the ratio of the maximum…