Modern Physics

Q. What is the energy of a photon emitted during the transition from n=3 to n=2 in a hydrogen atom?
  • A. 10.2 eV
  • B. 1.89 eV
  • C. 12.1 eV
  • D. 3.4 eV
Q. What is the energy of a photon with a frequency of 5 x 10^14 Hz?
  • A. 3.1 x 10^-19 J
  • B. 2.5 x 10^-19 J
  • C. 4.0 x 10^-19 J
  • D. 6.6 x 10^-19 J
Q. What is the energy of a photon with a frequency of 5 x 10^14 Hz? (h = 6.63 x 10^-34 J.s)
  • A. 3.31 x 10^-19 J
  • B. 1.32 x 10^-19 J
  • C. 2.65 x 10^-19 J
  • D. 4.98 x 10^-19 J
Q. What is the energy of a photon with a wavelength of 500 nm?
  • A. 3.98 eV
  • B. 2.48 eV
  • C. 1.24 eV
  • D. 0.62 eV
Q. What is the energy of the ground state of a hydrogen atom?
  • A. -13.6 eV
  • B. -3.4 eV
  • C. 0 eV
  • D. 13.6 eV
Q. What is the half-life of a radioactive isotope?
  • A. Time taken for half of the sample to decay
  • B. Time taken for the entire sample to decay
  • C. Time taken for the sample to double
  • D. None of the above
Q. What is the half-life of a radioactive substance if it takes 10 years for half of the substance to decay?
  • A. 5 years
  • B. 10 years
  • C. 20 years
  • D. 30 years
Q. What is the half-life of a radioactive substance?
  • A. The time taken for half of the substance to decay
  • B. The time taken for the entire substance to decay
  • C. The time taken for the substance to double
  • D. The time taken for the substance to reach equilibrium
Q. What is the main application of nuclear fusion?
  • A. Nuclear power plants
  • B. Atomic bombs
  • C. Hydrogen bombs
  • D. Medical imaging
Q. What is the main characteristic of a black body?
  • A. It reflects all incident light
  • B. It absorbs all incident light
  • C. It emits light only at high temperatures
  • D. It emits light only at low temperatures
Q. What is the main difference between alpha and beta radiation?
  • A. Charge
  • B. Mass
  • C. Speed
  • D. Penetrating power
Q. What is the main difference between classical and quantum mechanics?
  • A. Determinism vs. probability
  • B. Energy conservation
  • C. Force laws
  • D. Motion equations
Q. What is the main difference between nuclear fission and nuclear fusion?
  • A. Fission combines nuclei, fusion splits them
  • B. Fission splits nuclei, fusion combines them
  • C. Fission occurs in stars, fusion occurs in reactors
  • D. Fission is safer than fusion
Q. What is the main difference between nuclear fusion and nuclear fission?
  • A. Fusion combines nuclei, fission splits them
  • B. Fusion splits nuclei, fission combines them
  • C. Fusion occurs in stars, fission occurs in reactors
  • D. Both are the same process
Q. What is the main product of nuclear fusion in stars?
  • A. Helium
  • B. Hydrogen
  • C. Carbon
  • D. Iron
Q. What is the main reason for the stability of atomic nuclei?
  • A. Electromagnetic force
  • B. Gravitational force
  • C. Strong nuclear force
  • D. Weak nuclear force
Q. What is the main reason for the stability of the electron orbits in an atom?
  • A. Centripetal force
  • B. Electrostatic force
  • C. Quantum mechanics
  • D. All of the above
Q. What is the main reason for the stability of the nucleus in an atom?
  • A. Electromagnetic force
  • B. Gravitational force
  • C. Strong nuclear force
  • D. Weak nuclear force
Q. What is the main reason for the stability of the nucleus?
  • A. Electromagnetic force
  • B. Gravitational force
  • C. Strong nuclear force
  • D. Weak nuclear force
Q. What is the majority charge carrier in a P-type semiconductor?
  • A. Electrons
  • B. Holes
  • C. Neutrons
  • D. Protons
Q. What is the mass defect in a nucleus?
  • A. The difference between the mass of the nucleus and the sum of the masses of its nucleons
  • B. The mass of the nucleus itself
  • C. The mass of the electrons surrounding the nucleus
  • D. The mass of the binding energy
Q. What is the maximum kinetic energy of photoelectrons emitted if the incident light has a frequency of 8 x 10^14 Hz and the work function is 3 eV?
  • A. 1 eV
  • B. 3 eV
  • C. 5 eV
  • D. 7 eV
Q. What is the maximum kinetic energy of photoelectrons emitted when light of frequency 8 x 10^14 Hz is incident on a metal with work function 3 eV?
  • A. 1 eV
  • B. 3 eV
  • C. 5 eV
  • D. 7 eV
Q. What is the maximum kinetic energy of photoelectrons if the incident light has a frequency of 8 x 10^14 Hz and the work function is 3 eV?
  • A. 1 eV
  • B. 3 eV
  • C. 5 eV
  • D. 7 eV
Q. What is the maximum number of electrons in the d-subshell?
  • A. 2
  • B. 6
  • C. 10
  • D. 14
Q. What is the maximum number of electrons that can occupy a single p subshell?
  • A. 2
  • B. 6
  • C. 10
  • D. 14
Q. What is the maximum number of electrons that can occupy the d subshell?
  • A. 2
  • B. 6
  • C. 10
  • D. 14
Q. What is the maximum number of electrons that can occupy the f subshell?
  • A. 2
  • B. 6
  • C. 10
  • D. 14
Q. What is the maximum number of electrons that can occupy the n=3 energy level?
  • A. 2
  • B. 8
  • C. 18
  • D. 32
Q. What is the maximum wavelength of light that can cause the photoelectric effect in a metal with a work function of 2.0 eV?
  • A. 620 nm
  • B. 400 nm
  • C. 500 nm
  • D. 300 nm
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