MDCAT Pakistan · Physics

Electromagnetic Induction, AC and Modern Physics

8 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 8 questions

  1. Light of frequency f = 8.0 x 10^14 Hz strikes a metal surface with work function Phi = 2.0 eV. What is the maximum kinetic energy of the emitted photoelectrons? (Planck's constant h = 4.14 x 10^-15 eV…
  2. In a series RLC alternating current circuit with R = 30 ohms, inductive reactance X_L = 80 ohms, and capacitive reactance X_C = 40 ohms, what is the circuit impedance Z?
  3. What is the de Broglie wavelength of an electron accelerated through a potential difference of 100 V? (Take h / sqrt(2me) = 1.227 nm V^(1/2))
  4. According to the Bohr model, what is the radius of the third orbit (n = 3) of a hydrogen atom if the first Bohr radius is r1 = 0.529 Angstroms?
  5. A radioactive sample has a half-life of 8.0 days. What fraction of the original radioactive nuclei remains undecayed after 32 days?
  6. What is the root-mean-square (RMS) voltage of a sinusoidal domestic alternating current supply that has a peak voltage of 311 V?
  7. Which nuclear decay mode decreases the atomic number Z of a parent nucleus by 1 while leaving the mass number A unchanged?
  8. In mass spectrometry, why does the binding energy per nucleon peak around iron-56 (approx. 8.8 MeV per nucleon)?

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