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CAIE A-Level Physics A2 22 Quantum Physics Questions

Practise analysing photon energy and momentum, photoelectric emission, wave-particle evidence, de Broglie matter waves and quantised line spectra.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • calculate and interpret photon energy and momentum, including energy, frequency, wavelength and radiation-force relationships
  • explain and calculate photoelectric emission using threshold conditions, work function and maximum kinetic energy
  • use photoelectric, interference and diffraction evidence to evaluate wave�particle duality and apply de Broglie wavelength
  • interpret atomic energy levels and emission or absorption spectra as quantised transitions
  • calculate photon frequency or energy from an atomic energy-level difference

Covered syllabus points

22.1 Energy and momentum of a photon22.2 Photoelectric effect22.3 Wave–particle duality22.4 Energy levels in atoms and line spectra

Question 1

[Maximum number: 7]

Question (a)

(a)

State what is meant by a photon.

[ 2 ]

Question (b)

(b)

For an accelerating voltage of 32 kV in Fig. 8.1, determine:

[ 5 ]

Question (i)

(i)

the maximum momentum of an X-ray photon produced at the target

maximum photon momentum =
[ 2 ]

Question (ii)

(ii)

the minimum wavelength of X-rays produced at the target.

minimum wavelength =m [3]
[ 3 ]

Question 2

[Maximum number: 1]

In an experiment, electromagnetic radiation of frequency f is incident on a metal surface.

The results in Fig. 10.1 show the variation with frequency f of the maximum kinetic energy EMAX E_{\text {MAX }} of electrons emitted from the surface.

Fig. 10.1

Fig. 10.1

The work function energy in eV for some metals is given in Table 10.1.

Table 10.1

Table 10.1

Determine the metal used in the experiment. Show your working.

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