Dual Nature of Radiation & Matter JEE Main PYQs PDF, 2020–2026

Dual Nature of Radiation & Matter questions per year

in the free PDF asked, not in the PDFThe PDF only has questions we can print in full with a checked answer, so it holds 148 of the 149 asked.

Topic-wise weightage by year

How many Dual Nature of Radiation & Matter questions each topic had in every JEE Main year (all shifts), counting every question asked, including ones not in the PDF. Darker cells mean more questions.

Swipe the table sideways for older years.

Newest questions (2026)

The 12 newest of the 16 JEE Main 2026 Dual Nature of Radiation & Matter questions in the free PDF, latest shift first.

1. JEE Main 2026 · 8 Apr · Shift 2 · Photoelectric Effect

   $K_{1}$ and $K_{2}$ be the maximum kinetic energies of photoelectrons emitted from a surface of a given material for the light of wavelength $\lambda_{1}$ and $\lambda_{2}$, respectively. If $\lambda_{1}=2\lambda_{2}$ then the work function of material is given by :

   Solve it online →

2. JEE Main 2026 · 8 Apr · Shift 2 · Photoelectric Effect

   A monochromatic source of light operating at 15 kW emits $2.5\times {10}^{{22}}$ photons $/{\mathrm{s}}$. The region of an electromagnetic spectrum to which the emitted electromagnetic radiation belongs to $\_\_\_\_$。

   (Take $h=6.6\times {10}^{{-34}}{\ \mathrm{J}}.{\mathrm{s}}$ and $c=3\times {10}^{8}{\ \mathrm{m}}/{\mathrm{s}}$ ).

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3. JEE Main 2026 · 6 Apr · Shift 2 · Davisson-Germer Experiment

   The de Broglie wavelength for an electron accelerated through the potential difference of $V_{1}$ volt is $\lambda_{1}$. When the potential difference is changed to $V_{2}$ volt, the associated de Broglie wavelength is increased by $50\%$. If $(V_{1}/V_{2})=(9/\alpha)$, then the value of $\alpha$ is $\_\_\_\_$。

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4. JEE Main 2026 · 5 Apr · Shift 1 · Davisson-Germer Experiment

   An electron of mass $m$ is moving in an electric field ${\vec{E}}=-2E_{{{\mathrm{o}}}}{\hat{i}}(E_{{{\mathrm{o}}}}=$ constant $>0)$, with an initial velocity ${\vec{V}}=v_{{{\mathrm{o}}}}{\hat{i}}(v_{{{\mathrm{o}}}}=$ constant $>0)$. If $\lambda_{{{\mathrm{o}}}}=\frac{h}{4mv_{{{\mathrm{o}}}}}$, its de Broglie wavelength at time $t$ is

   $\_\_\_\_$ .

   ( $e=$ charge of electron)

   Solve it online →

5. JEE Main 2026 · 5 Apr · Shift 2 · Davisson-Germer Experiment

   An electron is travelling with a velocity $v$ in free space and when it enters a medium, its velocity is reduced by $20\%$. The de Broglie wavelength of electron in the medium is $\alpha\lambda_{0}$, where $\lambda_{0}$ is its de Broglie wavelength in free space. The value of $\alpha$ is $\_\_\_\_$ .

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6. JEE Main 2026 · 5 Apr · Shift 1 · Photoelectric Effect

   Light source having wavelength 331 nm is used to generate photo-electrons whose stopping potential is 0.2 V . The work function of the used metal in the experiment is $\alpha\times {10}^{{-19}}{\ \mathrm{J}}$. The value of $\alpha$ is $\_\_\_\_$ .

   $\left({\mathrm{h}}=6.62\times {10}^{{-34}}{\ \mathrm{J}}{\ \mathrm{s}},{\mathrm{e}}=1.6\times {10}^{{-19}}{\mathrm{C}}\text{ and}{\mathrm{c}}=3\times {10}^{8}{\ \mathrm{m}}/{\mathrm{s}}\right)$

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7. JEE Main 2026 · 4 Apr · Shift 2 · Davisson-Germer Experiment

   The de Broglie wavelength associated with an electron accelerated through a potential difference V is $\lambda_{{{\mathrm{e}}}}$ and the de Broglie wavelength associated with a proton accelerated through the same potential difference is $\lambda_{{{\mathrm{p}}}}$. If their corresponding masses are $m_{{{\mathrm{e}}}}$ and $m_{{{\mathrm{p}}}}$, respectively, then the ratio of their de Broglie wavelengths $\left(\frac{\lambda_{e}}{\lambda_{p}}\right)$ is $\_\_\_\_$ .

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8. JEE Main 2026 · 4 Apr · Shift 1 · Photoelectric Effect

   The graph shows variation of stopping potential $V_{{{\mathrm{o}}}}$ with the frequency $v$ of the incident radiation for three photosensitive metals $X_{1},X_{2}$ and $X_{3}$. Which metal will give out electrons with greater kinetic energy, for the same wavelength of incident radiation?
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9. JEE Main 2026 · 2 Apr · Shift 1 · Photoelectric Effect

   For a certain metal, when monochromatic light of wavelength $\lambda$ is incident, the stopping potential for photoelectrons is $3V_{0}$. When the same metal is illuminated by light of wavelength $2\lambda$, then the stopping potential becomes $V_{0}$. The threshold wavelength for photoelectric emission for the given metal is $\alpha\lambda$. The value of $\alpha$ is ______.

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10. JEE Main 2026 · 28 Jan · Shift 1 · Davisson-Germer Experiment

    The ratio of de Broglie wavelength of a deutron with kinetic energy $E$ to that of an alpha particle with kinetic energy $2E$, is $n:1$. The value of $n$ is $\_\_\_\_$ .

    (Assume mass of proton $=$ mass of neutron) $:$

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11. JEE Main 2026 · 28 Jan · Shift 2 · Photoelectric Effect

    Number of photons of equal energy emitted per second by a 6 mW laser source operating at 663 nm is ________.
    (Given : $h=6.63\times {10}^{{-34}}$ J.s and $c=3\times {10}^{{8}}$ m/s)

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12. JEE Main 2026 · 24 Jan · Shift 2 · Photoelectric Effect

    When a light of a given wavelength falls on a metallic surface the stopping potential for photoelectrons is 3.2 V . If a second light having wavelength twice of first light is used, the stopping potential drops to 0.7 V . The wavelength of first light is $\_\_\_\_$ m .

    $\left({\mathrm{h}}=6.63\times {10}^{{-34}}{\ \mathrm{J}}.{\mathrm{s}},{\mathrm{e}}=1.6\times {10}^{{-19}}{\mathrm{C}},{\mathrm{c}}=3\times {10}^{8}{\ \mathrm{m}}/{\mathrm{s}}\right)$

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