15.1 Quantum Physics

• Planck's constant relates the energy of a photon to its frequency.

  True
• What is the focus of quantum physics?

  Discrete energy and matter
• What phenomenon demonstrates the particle-like nature of light?

  Photoelectric effect
• The Stefan-Boltzmann law states that emitted power is proportional to the fourth power of temperature
• Classical physics predicted the ultraviolet catastrophe, which was resolved by quantization
• The kinetic energy of ejected electrons depends on the frequency
• What is a blackbody in the context of radiation?

  A perfect absorber and emitter
• What does Wien's Displacement Law state about the peak wavelength of blackbody radiation?

  Inversely proportional to temperature
• The work function is the minimum energy required to eject an electron from the metal surface
• Which theory successfully explains the photoelectric effect?

  Quantum physics
• Light exhibits wave-like behavior through interference and diffraction
• Match the concepts of the Bohr Model with their descriptions:

  Electron Orbits ↔️ Specific circular paths

  Transitions ↔️ Emit or absorb photons

  Hydrogen Spectrum ↔️ Specific spectral lines
• The photoelectric effect demonstrates the particle-like nature of light in quantum physics.


  True
• Which effect demonstrates the particle-like nature of light by showing the emission of electrons when light strikes a material?

  Photoelectric effect
• Match the concept with its description:

  Quantization ↔️ Discrete amounts of energy

  Planck's Constant ↔️ Relates energy to frequency

  Photoelectric Effect ↔️ Electrons emitted by light
• A blackbody is a perfect absorber and emitter of radiation.
• Wien's Displacement Law relates the peak wavelength to the inverse of the temperature.
• What is the photoelectric effect used to demonstrate about the nature of light?

  Particle-like nature
• What is one experimental result of the photoelectric effect that classical wave theory could not explain?

  Instantaneous emission
• Electron diffraction demonstrates the particle-like behavior of matter.

  False
• The idea that energy exists in discrete amounts is called quantization
• Match the concept with its description:

  Continuity ↔️ Continuous values for energy

  Quantization ↔️ Discrete values for energy

  Determinism ↔️ Predictable outcomes

  Probabilism ↔️ Uncertain outcomes
• Wien's displacement law relates peak wavelength to temperature.


  True
• What is the photoelectric effect?

  Emission of electrons by light
• What depends on the light intensity in the photoelectric effect?

  Number of ejected electrons
• Blackbody radiation emits radiation across a continuous spectrum.


  True
• Classical physics could explain the ultraviolet catastrophe in blackbody radiation.

  False
• In the photoelectric effect, the kinetic energy of ejected electrons depends on light intensity.

  False
• Wave-particle duality states that light and matter can exhibit both wave-like and particle-like properties.

  True
• The Bohr Model describes electrons orbiting the nucleus in continuous energy levels.

  False
• Unlike classical physics, quantum physics focuses on phenomena where energy exists in discrete amounts called quanta
• What is the term for the idea that energy, momentum, and other physical quantities exist in discrete amounts?

  Quantization
• In quantum physics, energy and momentum have continuous values.

  False
• At what scale is quantum physics most applicable?

  Microscale systems
• What happens to the wavelength of emitted radiation as the temperature of a blackbody increases?

  Becomes shorter
• What did classical physics predict about the radiation spectrum of a blackbody, which was later resolved by quantum physics?

  Continuous increase in energy
• The minimum energy required to eject an electron from a metal surface is called the work function.
• Wave-particle duality states that light and matter can exhibit both wave-like and particle-like properties.
• What does the principle of wave-particle duality state?

  Light and matter have both wave-like and particle-like properties
• Match the concept with its corresponding behavior:

  Light ↔️ Interference

  Matter ↔️ Electron Diffraction