plumiQuantum behaviour: phasors and paths: OCR A‑Level Physics B questions
OCR A-Level Physics B past-paper questions on 4.1.5 Quantum behaviour: phasors and paths, 2016–2025, with mark schemes and examiner’s reports where available.
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Q39(b)(ii)
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Open the full PDFQ6(c)(iii)
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Open the full PDFYour answerQ40(a)
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Open the full PDFQ40(b)(i)
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Open the full PDFQ4(c)
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Open the full PDFYour answerQ3(a)
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All 22 questions on Quantum behaviour: phasors and paths, as a list
- June 2025, Paper 1, Q39(b)(ii) (6 marks): Fig. 39.1 shows the apparatus used by a student to investigate the properties of microwaves. The microwaves from transmitter T are detected by the vertical meta
- June 2025, AS Paper 1, Q15 (1 mark): The diagram shows the amplitude and phase of the phasors representing three waves of the same frequency. 5.8 1.2 3.5 The waves arrive simultaneously at the same
- June 2024, Paper 1, Q34(b) (2 marks): Fig. 34.2 shows a circuit containing a source of alternating emf, a resistor and a component, X. A dual-trace oscilloscope is used to observe the potential diff
- June 2024, AS Paper 2, Q6(c)(iii) (6 marks): (iii)* The behaviour of light can be explained in terms of the wave model or the model of photons with a phasor amplitude. Describe how both the wave model of l
- June 2023, AS Paper 1, Q18 (1 mark): Phasors representing waves from 3 sources are shown in the diagram. Adding phasors in this way models: A absorption B coherence C diffraction D superposition Yo
- June 2022, Paper 1, Q40(a) (2 marks): Explain how this experiment demonstrates that electrons show wave-like and particle-like properties. [2]
- June 2022, Paper 1, Q40(b)(i) (2 marks): Carefully draw the resultant phasors on Fig. 40.3 for points A and B. [2]
- June 2022, Paper 1, Q40(b)(ii) (2 marks): The probability of an electron arriving at a given point is proportional to the square of the resultant phasor amplitude at that point. Use measurements from th
- June 2022, AS Paper 1, Q5 (1 mark): A diffraction grating has three slits. An intensity maximum is produced on a distant screen where the phase difference between light from successive slits is 2π
- November 2021, Paper 2, Q10 (6 marks): 10* Explain how superposition is used by bats and in ultrasound scanners to increase the power of the ultrasound beam in a desired direction or location. You sh
- November 2021, AS Paper 1, Q5 (1 mark): A particle travels through a distance equal to its de Broglie wavelength. During this time, its phasor will rotate through an angle π A 2 B π 3π C 2 D 2π Your a
- November 2020, Paper 1, Q35(a) (2 marks): Explain why the intensity varies as it does. [2]
- June 2019, Paper 1, Q35 (3 marks): Fig. 35 (not to scale) shows a double slit illuminated by laser light. The positions of the central maximum and the first minimum for the waves incident on a di
- June 2019, Paper 2, Q4(c) (6 marks): This question is about electrons showing wave-like properties. (c)* Explain how this demonstration shows that electrons can be considered as ‘quantum particles’
- June 2019, AS Paper 1, Q10 (1 mark): A sensor is made up of 32 × 32 pixels. In one experiment: – a source emits 4096 photons, all of which are detected by the sensor; – the probability of arrival o
- June 2019, AS Paper 1, Q13 (1 mark): The diagram shows a number of phasors. R Q S P T The two phasors with a phase difference of π radians are A P and R B P and S C Q and T D S and R Your answer [1
- June 2018, AS Paper 1, Q5 (1 mark): Monochromatic light passes through 3 closely spaced parallel slits at a point. A maximum is produced at a point on a distant screen where the phase difference b
- June 2017, Paper 1, Q10 (1 mark): Which one of the following statements about photons is correct? The probability of arrival of a photon at a position A is proportional to the amplitude of the w
- June 2017, AS Paper 1, Q14 (1 mark): Two photons from the same monochromatic laser arrive at a detector via two possible paths. The phasor representing each photon path is shown below. The amplitud
- June 2017, AS Paper 2, Q3(a) (2 marks): The phasor for the light from slit A at point 1 is shown below. Add to this diagram the phasors for the light at point 1 from slits B and C and their resultant.
- June 2017, AS Paper 2, Q3(b) (1 mark): At the points marked ‘minimum’, the light has zero intensity. Draw a phasor diagram to show how this is achieved. [1]
- June 2017, AS Paper 2, Q3(c) (2 marks): The intensity of light at the maxima marked 3 is exactly the same as at the point marked 1. At the places marked 2 the intensity of light is much less, even tho
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