A-level PHYSICS Paper 1 May 2019

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Two isotopes of iodine are 125 53 I and 131 53 I. Determine, for these two isotopes, the difference between the constituents of the nuclei. [1 mark] 0 1 . 2 A 131 53 I nuclide undergoes beta (�... �– ) decay to form a xenon nuclide. State the nucleon number of the xenon nuclide. [1 mark] 0 1 . 3 A 125 53 I nuclide decays by electron capture to form a tellurium nuclide. State two differences between the constituents of the iodine nucleus and the tellurium nucleus it decays into. [2 marks] 3 *03* Turn over ► IB/M/Jun19/7408/1 Do not write outside the box 0 1 . 4 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. [3 marks] 1 2 3 Turn over for the next question 7 4 *04* IB/M/Jun19/7408/1 Do not write outside the 0 2 box 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 fro [Show More]

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