QuestionQuestionConceptConceptDocumentDocument

22. Quantum physics

Start with Concept to understand a topic, then use Question Bank to check what you know.

4 topics · 17 learning objectives

Your progress

Sign in to see your mastery and mistakes.

  1. 22.1 Energy and momentum of a photon

    1. 22.1.1Electromagnetic radiation has a particulate nature

      • understand that electromagnetic radiation has a particulate nature

    2. 22.1.2A photon is a quantum of electromagnetic energy

      • understand that a photon is a quantum of electromagnetic energy

    3. 22.1.3E = hf

      • recall and use E = hf

    4. 22.1.4The electronvolt (eV) as a unit of energy

      • use the electronvolt (eV) as a unit of energy

    5. 22.1.5A photon has momentum and that the momentum is given by p = E / c

      • understand that a photon has momentum and that the momentum is given by p = E / c

  2. 22.2 Photoelectric effect

    1. 22.2.1Photoelectrons may be emitted from a metal surface when it is illuminated by

      • understand that photoelectrons may be emitted from a metal surface when it is illuminated by electromagnetic radiation

    2. 22.2.2The terms threshold frequency and threshold wavelength

      • understand and use the terms threshold frequency and threshold wavelength

    3. 22.2.3Photoelectric emission in terms of photon energy and work function energy

      • explain photoelectric emission in terms of photon energy and work function energy

    4. 22.2.4Hf = Φ + 1/2 mvmax 2

      • recall and use hf = Φ + 1/2 mvmax 2

    5. 22.2.5Why the maximum kinetic energy of photoelectrons is independent of

      • explain why the maximum kinetic energy of photoelectrons is independent of intensity, whereas the photoelectric current is proportional to intensity

  3. 22.3 Wave–particle duality

    1. 22.3.1The photoelectric effect provides evidence for a particulate nature of

      • understand that the photoelectric effect provides evidence for a particulate nature of electromagnetic radiation while phenomena such • As interference and diffraction provide evidence for a wave nature

    2. 22.3.2And interpret qualitatively the evidence provided by electron diffraction

      • describe and interpret qualitatively the evidence provided by electron diffraction for the wave nature of particles

    3. 22.3.3The de Broglie wavelength as the wavelength associated with a moving

      • understand the de Broglie wavelength as the wavelength associated with a moving particle

    4. 22.3.4Λ = h / p

      • recall and use λ = h / p

  4. 22.4 Energy levels in atoms and line spectra

    1. 22.4.1There are discrete electron energy levels in isolated atoms (e.g. atomic

      • understand that there are discrete electron energy levels in isolated atoms (e.g. atomic hydrogen)

    2. 22.4.2The appearance and formation of emission and absorption line spectra

      • understand the appearance and formation of emission and absorption line spectra

    3. 22.4.3Hf = E1 – E2

      • recall and use hf = E1 – E2