AQA A Level Physics Paper 1 2019 Question Paper

Document Content and Description Below

Two isotopes of iodine are 125 I and 131 I. 53 53 Determine, for these two isotopes, the difference between the constituents of the nuclei. [1 mark] 0 1 . 2 A 131 I nuclide undergoes beta (β ... – ) decay to form a xenon nuclide. 53 State the nucleon number of the xenon nuclide. [1 mark] 0 1 . 3 A 125 I nuclide decays by electron capture to form a tellurium nuclide. 53 State two differences between the constituents of the iodine nucleus and the tellurium nucleus it decays into. [2 marks] Stuvia.co.uk - The Marketplace for Revision Notes & Study Guides 3 Turn over ► *03* IB/M/Jun19/7408/1 4 7 . Internal conversion is a process in which a nucleus in an excited state can release its excess energy. In internal conversion all of the excess energy is transferred from the nucleus to an orbital electron through the electromagnetic force. This orbital electron is ejected from the atom. The tellurium nucleus formed in question 01.3 is in an excited state and can undergo internal conversion. Discuss three differences between internal conversion and beta (β – ) decay. Do not write outside the box [3 marks] 1 2 3 Turn over for the next question 0 1 4 *04* IB/M/Jun19/7408/1 1 2 Some cars are fitted with a water sensor designed to switch on windscreen wipers automatically when it rains. Figure 1 shows a simplified diagram of the sensor. Figure 1 A light ray travels from the light-emitting diode (LED) through the first prism and into the windscreen. The ray reflects off the surfaces of the windscreen at A, B and C and then passes through the second prism into the detector. Do not write outside the box . Suggest how the design ensures that there is no deviation of the ray as it enters the first prism. [1 mark] . Suggest two features of the design that ensure that there is no deviation of the ray as it leaves the first prism and enters the windscreen glass. [2 marks] 1 2 0 2 0 2 0 2 Stuvia.co.uk - The Marketplace for Revision Notes & Study Guides 5 Turn over ► *05* IB/M/Jun19/7408/1 . 3 The refractive index of the windscreen glass is 1.52 Explain why the ray follows the path shown inside the windscreen glass in Figure 1. Support your answer with a suitable calculation. Do not write outside the box [2 marks] Question 2 continues on the next page 0 2 Stuvia.co.uk - The Marketplace for Revision Notes & Study Guides 6 *06* IB/M/Jun19/7408/1 . 4 When it starts to rain, water droplets form on the outside of the windscreen as shown in Figure 2. Do not write outside the box Figure 2 The refractive index of water is 1.33 Explain why the presence of water at A causes the intensity of the light at the detector to decrease. Support your answer with a suitable calculation. [2 marks] 0 2 7 IB/M/Jun19/7408/1 Distribution of this document is illegal 5 6 . The refractive index of the windscreen glass can vary by a few per cent across the thickness of the glass. Discuss how this variation may affect the path of the ray through the windscreen glass. Do not write outside the box [2 marks] . A different design has the LED and the detector further apart. The ray undergoes more reflections inside the windscreen glass before reaching the detector. Discuss two ways in which this different design affects the sensitivity of the sensor to the presence of water droplets. [2 marks] 1 2 *07* Turn over ► 0 2 0 2 11 8 IB/M/Jun19/7408/1 Distribution of this document is illegal 1 2 Figure 3 shows an arrangement to investigate diffraction. White light is incident on a single slit. After leaving the slit, the diffracted light passes through a green filter to reach the screen. Figure 3 Do not write outside the box . Describe the pattern produced on the screen. [2 marks] . The green filter is replaced with a red filter. Describe the change in the pattern produced on the screen. [2 marks] [Show More]

Last updated: 1 year ago

Preview 1 out of 41 pages