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1. Which of the following phenomena confirms the wave nature of electrons?

A. Photoelectric effect B. Compton effect C. Electron diffraction D. Zeeman effect

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2. The work function of a material is the minimum energy required to:

A. Emit an electron from the surface B. Emit a photon from the surface C. Move an electron within the material D. Excite an atom

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3. The energy of a photon is directly proportional to:

A. Wavelength B. Frequency C. Amplitude D. Velocity

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4. The stopping potential in a photoelectric effect depends on:

A. Intensity of light B. Frequency of light C. Velocity of light D. Wavelength of light

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5. Which of the following statements is true regarding the photoelectric effect?

A. It supports the wave theory of light B. It is independent of the frequency of light C. It is an instantaneous process D. It occurs only for ultraviolet light

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6. The maximum kinetic energy of photoelectrons is given by:

A. hv B. hv - φ C. hv + φ D. φ - hv

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7. A proton and an electron have the same de Broglie wavelength. The ratio of their momenta is:

A. 1:1 B. mp:me C. me:mp D. 1:√(mp/me)

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8. The threshold wavelength of a material is 600 nm. What is the work function of the material?

A. 2.07 eV B. 1.65 eV C. 3.31 eV D. 2.48 eV

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9. When ultraviolet light falls on a zinc surface, it emits electrons because:

A. Ultraviolet light has high intensity B. Ultraviolet light has high frequency C. Zinc has a high work function D. Ultraviolet light has short wavelength

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10. What happens to the photoelectric current when the intensity of incident light is doubled?

A. It doubles B. It becomes half C. It remains the same D. It decreases exponentially

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11. The de Broglie wavelength of a particle is inversely proportional to its:

A. Velocity B. Momentum C. Frequency D. Energy

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12. Which of the following cannot be explained by the particle nature of light?

A. Photoelectric effect B. Compton effect C. Diffraction D. Emission spectra

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13. A photon of energy 10 eV collides with a stationary electron. What is the energy of the scattered photon if the scattering angle is 90°?

A. 10 eV B. 8 eV C. 5 eV D. 9 eV

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14. The Compton wavelength shift is maximum when the scattering angle is:

A. 0° B. 45° C. 90° D. 180°

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15. The work function of a metal is 4.2 eV. What is the maximum kinetic energy of emitted photoelectrons if the incident light has an energy of 6 eV?

A. 1.8 eV B. 2.0 eV C. 4.2 eV D. 6 eV

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16. In a photoelectric experiment, the stopping potential is 3 V. What is the maximum kinetic energy of the photoelectrons?

A. 3 eV B. 1.5 eV C. 6 eV D. 0.3 eV

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17. The threshold frequency of a material is 5 × 10¹⁴ Hz. What is the threshold wavelength?

A. 600 nm B. 500 nm C. 400 nm D. 300 nm

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18. What is the momentum of a photon of wavelength 500 nm?

A. 3.3 × 10⁻²⁸ kg·m/s B. 4.1 × 10⁻²⁸ kg·m/s C. 2.5 × 10⁻²⁸ kg·m/s D. 5.0 × 10⁻²⁸ kg·m/s

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19. Electrons are accelerated through a potential difference of 150 V. What is the de Broglie wavelength associated with them?

A. 1 nm B. 2 nm C. 0.1 nm D. 0.05 nm

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20. Which of the following graphs correctly represents the variation of kinetic energy with frequency in the photoelectric effect?

A. Straight line passing through origin B. Straight line with negative intercept C. Parabolic curve D. Hyperbolic curve