4.5. Quantum Physics

• The position and momentum of a particle can be measured simultaneously with arbitrary precision in quantum physics.

  False
• What principle states that measurements disturb the system in quantum physics?

  Uncertainty Principle
• When an electron transitions between energy levels, it must absorb or emit a photon
• What is the process called when an electron absorbs or emits a photon during a transition?

  Electronic transitions
• In quantum physics, particles exhibit both wave-like and particle-like properties, a concept known as wave-particle duality
• The energy levels in an atom are continuous rather than quantized.

  False
• In atomic structure, electrons can only occupy discrete, quantized energy levels
• The photoelectric effect has a threshold frequency below which no electrons are emitted, regardless of intensity.

  True
• What is the value of Planck's constant in SI units?

  $6.626 \times 10^{ - 34}$
• The Uncertainty Principle states that the position and momentum of a particle cannot be measured simultaneously with arbitrary precision
• When an electron transitions to a lower energy level, it emits a photon.


  True
• An electron emits a photon when it transitions to a higher energy level.

  False
• In atomic structure, electrons occupy discrete, quantized energy levels
• What is the term for the fixed, discrete energy levels that electrons in an atom can occupy?

  Quantized energy levels
• The quantization of energy levels and the absorption or emission of photons during transitions are key features of quantum mechanics.
• In the photoelectric effect, there is a threshold frequency below which no electrons are emitted.
• De Broglie's Hypothesis suggests that matter has both wave-like and particle-like properties.


  True
• The Uncertainty Principle states that the position and momentum of a particle cannot be measured simultaneously with arbitrary precision.
• The probability of quantum tunneling increases exponentially with the height of the barrier.

  False
• What is quantum physics the study of?

  Matter and energy behavior
• Match the characteristic with the correct physics type:

  Deterministic events ↔️ Classical physics

  Probabilistic events ↔️ Quantum physics
• Quantum physics applies to macroscopic objects.

  False
• Energy levels in quantum physics have specific, fixed values.


  True
• Quantum physics studies matter and energy on the atomic and subatomic scale.
• The Uncertainty Principle states that the position and momentum of a particle can be measured simultaneously with arbitrary precision.

  False
• What happens when an electron transitions between energy levels in an atom?

  Absorbs or emits a photon
• What is the photoelectric effect?

  Emission of electrons from light
• What does De Broglie's Hypothesis extend the wave-particle duality to?

  Matter
• Quantum physics studies matter and energy on the atomic
• Match the concepts of classical physics with their quantum physics counterparts:

  Deterministic events ↔️ Probabilistic events

  Well-defined positions and momenta ↔️ Wave-particle duality

  Measurements do not affect the system ↔️ Measurements disturb the system

  Applies to macroscopic objects ↔️ Applies to microscopic objects
• Order the relationships in electronic transitions and energy levels:

  1️⃣ Energy levels and electronic transitions

  2️⃣ Photon energy and energy level differences

  3️⃣ Absorption and emission
• In quantum physics, electronic transitions involve the absorption or emission of a photon
• Order the steps in an electronic transition process:

  1️⃣ Electron in a lower energy level

  2️⃣ Absorption of a photon

  3️⃣ Electron transitions to a higher energy level
• When an electron transitions to a lower energy level, it emits a photon with energy equal to the difference between the two levels.


  True
• What is the photoelectric effect?

  Emission of electrons from light
• What happens to the energy of emitted electrons in the photoelectric effect as the frequency of light increases?

  It increases
• What is the equation for calculating the de Broglie wavelength of a particle?

  $λ =$$h / p$
• The Uncertainty Principle is compatible with classical physics.

  False
• Quantum tunneling has applications in technologies like scanning tunneling microscopes and nuclear fusion reactors.
• Particles can exhibit properties of both particles and waves