New Zealand Scholarship · Physics and Chemistry

Electromagnetism, Quantum Phenomena and Modern Physics

37 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 37 questions

  1. In the photoelectric effect, what happens to the maximum kinetic energy of emitted photoelectrons when the intensity of incident light is doubled?
  2. What is the de Broglie wavelength of an electron of mass m accelerated from rest across an electric potential difference V?
  3. A charged particle q enters a uniform magnetic field B with velocity v perpendicular to B. What is the radius of its circular trajectory?
  4. What is the physical meaning of Faraday's law of electromagnetic induction represented as emf = -d(Phi_B)/dt?
  5. According to the Bohr model of the hydrogen atom, what physical quantity is quantized in integer multiples of h / (2*pi)?
  6. What is the energy of a photon emitted when an electron transitions from n = 3 to n = 1 in hydrogen (E_n = -13.6 eV / n^2)?
  7. What is the Hall effect and what fundamental property of charge carriers does it determine?
  8. What does Heisenberg's uncertainty principle state regarding the simultaneous measurement of position x and momentum p?
  9. How is the time constant tau defined for an RC charging circuit with resistor R and capacitor C?
  10. What happens to the magnetic field B at the center of an ideal long solenoid if its length is doubled while the total number of turns remains constant?
  11. In special relativity, how does the observed lifetime of an unstable muon traveling near the speed of light compare to its rest frame lifetime?
  12. What is the resonant frequency of an LC circuit consisting of inductor L and capacitor C?
  13. What is the Compton wavelength shift Delta lambda for a photon scattered at 90 degrees by a stationary free electron?
  14. Why does an alternating current in a primary coil induce a voltage in an adjacent secondary coil wound around a ferromagnetic core?
  15. What is the binding energy per nucleon of a nucleus and what does its variation across the periodic table indicate?
  16. What is the force per unit length between two long parallel wires separated by distance d carrying currents I_1 and I_2 in the same direction?
  17. What is the mass defect of a helium-4 nucleus (alpha particle) formed from two protons and two neutrons?
  18. What occurs when an unpolarized beam of light strikes a flat dielectric surface at Brewster's angle theta_B?
  19. What is the decay constant lambda of a radioactive isotope having a half-life of 5,730 years (carbon-14)?
  20. In a cyclotron, why is the orbital frequency of a circulating non-relativistic ion independent of its orbital radius?
  21. What is the energy of a photon of light having frequency 6.0 10^14 Hz (h = 6.63 10^-34 J s)?
  22. What type of nuclear radiation is most easily stopped by a thin sheet of paper or human skin?
  23. What is the role of the moderator in a thermal nuclear fission reactor (such as heavy water or graphite)?
  24. What did the Davisson-Germer experiment prove regarding electrons scattered from a nickel crystal?
  25. What is Lenz's law an immediate consequence of in classical physics?
  26. What is the magnetic flux through a flat circular coil of radius 0.10 m placed perpendicular to a 0.50 T magnetic field?
  27. What occurs during beta-plus (positron) radioactive decay inside a proton-rich atomic nucleus?
  28. In a step-up electrical transformer with 100 primary turns and 500 secondary turns, what is the output voltage if input is 230 V AC?
  29. What is the threshold frequency f_0 in the photoelectric effect?
  30. What fundamental particle mediates the electromagnetic force in the Standard Model of particle physics?
  31. What is the capacitance of a parallel-plate capacitor with plate area A, separation d, and dielectric constant kappa?
  32. What is the work function of a metal if incident photons of energy 4.5 eV eject electrons with maximum kinetic energy 1.8 eV?
  33. How does the resistance of an intrinsic semiconductor change as its temperature increases?
  34. What is the magnetic force on a straight 0.50 m wire carrying 4.0 A perpendicular to a uniform 0.30 T magnetic field?
  35. What nuclear reaction powers the core of the Sun during the main sequence stage?
  36. What is the energy of a photon of wavelength 500 nm? Use h = 6.63 x 10^-34 J s and c = 3.00 x 10^8 m/s.
  37. Photons of energy 3.5 eV fall on a metal with work function 2.0 eV. What is the maximum kinetic energy of the emitted photoelectrons?

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