Physics · 9702 · Paper 49702/04/SP/22
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- 2(a)Calculate the thermodynamic temperature of the gas.2 marks
- 2(b)(i)Show that the new volume of the gas is 4.75 × 10⁻² m³.1 mark
- 2(b)(ii)Explain your working.3 marks
- 2(c)(i)Use this information to calculate the external work done during the expansion of the gas.2 marks
- 2(c)(ii)Explain your reasoning.2 marks
- 3(a)(i)For the oscillating magnet, use data from Fig. 3.2 to determine, to two significant figures, the frequency f.2 marks
- 3(a)(ii)For the oscillating magnet, use data from Fig. 3.2 to determine, to two significant figures, the energy of the oscillations during the time interval t = 0 to t = 6.0 s.3 marks
- 3(b)Explain, with reference to Fig. 3.2, whether this damping is light, critical or heavy.1 mark
- 5(a)(i)Determine the root-mean-square (r.m.s.) value of the supply potential difference before rectification.2 marks
- 5(a)(ii)State the type of rectification shown in Fig. 5.1.1 mark
- 5(b)(i)On Fig. 5.1, draw a line to show V_OUT between times t = 1.0 ms and t = 5.0 ms.3 marks
- 5(b)(ii)Determine the time, in s, for which the capacitor is discharging between times t = 1.0 ms and t = 5.0 ms.1 mark
- 5(b)(iii)Using your smoothed V_OUT line drawn on Fig. 5.1 and the discharging time found in (b)(ii), calculate the resistance R.2 marks
- 8(a)Describe two phenomena associated with the photoelectric effect that cannot be explained using a wave theory of light.2 marks
- 8(b)(i)Identify the symbol λ₀.1 mark
- 8(b)(ii)Use Fig. 8.1 to determine the magnitude of λ₀.1 mark
- 8(b)(iii)Show your working.3 marks
- 8(c)On Fig. 8.1, draw a line to show the variation with 1/λ of E_max for the oxidised surface.2 marks
- 10(a)(i)State what is meant by contrast in an X-ray image.1 mark
- 10(a)(ii)Calculate the ratio (intensity of radiation transmitted through the bone) / (intensity of radiation transmitted through the muscle).2 marks
- 10(b)(i)Explain how ultrasound pulses are used to obtain diagnostic information about internal body structures in medical diagnosis.3 marks
- 10(b)(iii)State the approximate value of the intensity reflection coefficient at the boundary between the two media when: • Z₁ is almost equal to Z₂ • Z₁ is very different from Z₂.2 marks
- 11(a)(i)State what is meant by a tracer.2 marks
- 11(a)(ii)State the name of the particles that are emitted from the body and detected by the detectors during PET scanning.1 mark
- 11(b)Explain how these particles are created from positrons.3 marks
- 11(c)Suggest why two of these photons are needed to create one positron.2 marks