plumiWave and photon models of light, E = hf: Edexcel International A Level Physics questions
Edexcel International A Level Physics past-paper questions on 2.3.6.1 Wave and photon models of light, E = hf, 2019–2025, with mark schemes and examiner’s reports where available.
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Q18(b)(ii)
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All 22 questions on Wave and photon models of light, E = hf, as a list
- June 2025, AS Unit 2, Q18(b)(ii) (4 marks): Determine the number of photons incident on the glass screen in this time. wavelength of UV light = 395 nm (4) Number of photons =
- June 2025, AS Unit 2, Q18(d) (2 marks): Suggest why the hardening time of the glue is reduced if the UV lamp is moved closer to the mobile phone screen. (2)
- January 2025, AS Unit 2, Q19(b) (5 marks): The scientist connected the photocell to an ammeter and battery, as shown. A photocell 1.5 V Photoelectrons are attracted to the electrode, causing a current in
- June 2024, AS Unit 2, Q17(a)(i) (2 marks): One of the emitted photons has an energy of 3.44 × 10 Calculate the frequency of this photon. (2) Frequency of photon =
- June 2024, AS Unit 2, Q18(c)(i) (2 marks): The sensor has a known surface area. Explain why knowing the number of photons arriving each second at the sensor can not be used to determine the intensity of
- June 2024, AS Unit 2, Q18(c)(ii) (5 marks): Light incident on the sensor causes a current in a circuit in the camera. Light with a power of 1.0 W is incident on the sensor. The graph shows the relationshi
- January 2024, AS Unit 2, Q19(b) (5 marks): Light from the Sun is incident on the solar cell. The intensity of the incident light is constant. Layer 1 has a greater work function than layer 2. Photons not
- January 2024, Unit 4, Q19(a) (3 marks): Collisions between electrons and oxygen atoms cause the emission of green light. Calculate the velocity of electrons that would cause green light of wavelength
- June 2023, AS Unit 2, Q17(b)(i) (4 marks): Determine the energy, in eV, of this photon. (4) Photon energy = eV
- October 2022, AS Unit 2, Q17(a)(ii) (4 marks): Calculate the number of photons emitted by the LED in one minute. (4) Number of photons emitted in one minute =
- October 2022, AS Unit 2, Q17(b) (2 marks): The red LED was replaced with a green LED which emits light with a shorter wavelength than the red LED. The current in the circuit did not change. Explain how r
- October 2021, AS Unit 2, Q18(b) (3 marks): The laser emits light with a wavelength of 532 nm. Calculate the energy, in J, of each photon. (3) Energy of photon = J
- October 2021, AS Unit 2, Q18(c)(ii) (1 mark): When photons arriving at the satellite are detected, only those with a wavelength of exactly 532 nm are used in the analysis of the results. Suggest why. (1)
- June 2021, AS Unit 2, Q15(a) (4 marks): The radiation from B has a wavelength of 280 nm. Show that this radiation has a photon energy of about 4.4 eV. (4)
- June 2021, AS Unit 3, Q4(a) (3 marks): Explain why a graph of Va against 1/λ should give a straight line. (3)
- June 2021, AS Unit 3, Q4(b)(iii) (3 marks): Determine the value of the Planck constant given by the student’s data. (3) Planck constant =
- June 2021, AS Unit 3, Q4(c) (4 marks): Each LED in the investigation emits a narrow range of wavelengths. The wavelength value stated by the manufacturer is the wavelength of light that is emitted wi
- January 2021, AS Unit 2, Q4 (1 mark): Electromagnetic radiation can be described in terms of a photon model. Which of the following demonstrates the photon model of light? A diffraction patterns B H
- January 2021, AS Unit 2, Q20(b) (3 marks): It is suggested that the energy per photon could be important in determining if the radiation emitted by the smart meter is dangerous. The smart meter transmits
- October 2020, Unit 4, Q12(b) (4 marks): Calculate the maximum wavelength of the gamma photons produced. (4) Wavelength =
- June 2019, AS Unit 2, Q14 (6 marks): *14 In 1921, Albert Einstein was awarded the Nobel Prize for Physics “for his discovery of the law of the photoelectric effect”. To explain this effect, Einstei
- June 2019, AS Unit 2, Q16(b) (3 marks): Calculate the energy, in eV, of a photon of visible light with a wavelength of 589 nm. (3) Photon energy = eV
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