2023 AQA GCSE COMBINED SCIENCE: TRILOGY 8464/P/1F Physics Paper 1F Question Paper & Mark scheme (Merged) June 2023 [VERIFIED]

2023 AQA GCSE COMBINED SCIENCE: TRILOGY 8464/P/1F Physics Paper 1F Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] Materials For this paper you must have: • a ruler • a scientific calculator • the Physics Equations Sheet (enclosed). Instructions • Use black ink or black ball-point pen. • Pencil should only be used for drawing. • Fill in the boxes at the top of this page. • Answer all questions in the spaces provided. • If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). • Do all rough work in this book. Cross through any work you do not want to be marked. • In all calculations, show clearly how you work out your answer. For Examiner’s Use Question Mark 1 2 3 4 5 6 TOTAL Information • The maximum mark for this paper is 70. • The marks for questions are shown in brackets. • You are expected to use a calculator where appropriate. • You are reminded of the need for good English and clear presentation in your answers. *JUN238464P1F01* IB/M/Jun23/E7 8464/P/1F 2 0 1 A scientist investigated the radiation emitted by different radioactive isotopes. The scientist had a sample of polonium-210. The radiation emitted by polonium-210 can be represented by the symbol 2 4 He. Which type of radiation can be represented by the symbol 2 4 0 1 . 1 He? [1 mark] Tick () one box. Alpha Beta Gamma 0 1 . 2 How many protons are there in a particle of radiation represented by 4 2 He? [1 mark] Tick () one box. 2 4 6 8 0 1 . 3 A polonium-210 (Po) nucleus changes into a lead (Pb) nucleus by emitting a 4 2 He particle. This is shown by the following nuclear equation. 21084Po → 206XPb + 4 2He What is the value of X? [1 mark] Tick () one box. Do not write outside the box *02* IB/M/Jun23/8464/P/1F 3 0 1 . 4 The sample of polonium-210 had an activity of 100 Bq. Complete the sentence. Choose the answer from the box. [1 mark] After one half-life, the activity of polonium-210 in the sample was Bq. Question 1 continues on the next page Do not write outside the box *03* Turn over ► IB/M/Jun23/8464/P/1F 4 The scientist investigated another radioactive isotope that is a source of gamma radiation. Figure 1 shows the equipment used. Figure 1 0 1 . 5 The count-rate is the number of counts detected each second. In 30 seconds the number of counts detected was 1500. Calculate the count-rate. [2 marks] Count-rate = counts per second Do not write outside the box *04* IB/M/Jun23/8464/P/1F 5 The scientist placed a thick sheet of lead between the source of gamma radiation and the detector. 0 1 . 6 What was the effect of the sheet of lead on the count-rate? Give a reason for your answer. [2 marks] Effect Reason 0 1 . 7 The lead was irradiated by the gamma radiation. What happened to the lead when it was irradiated by the gamma radiation? [1 mark] Tick () one box. The lead atoms became radioactive. The lead gained atoms from the radioactive source. The lead was exposed to gamma radiation. Question 1 continues on the next page Do not write outside the box *05* Turn over ► IB/M/Jun23/8464/P/1F 6 0 1 . 8 Gamma radiation is emitted from the nucleus of an atom. Complete the sentence. Choose the answer from the box.