[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-207858-en":3,"doc-seo-207858-105":30,"detail-sidebar-cat-0-en-105":90},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":4,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},207858,962084925782,"Chloe Bennett","https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc",4,"Exam","International GCSE Combined Science Double Award - 9204/PE Physics - Paper 3 - Extension Paper","Aimed at International GCSE Combined Science Double Award learners, this specimen Physics Paper 3 extension paper sets out required materials and exam instructions before presenting a structured question sequence. It covers radioactive isotopes and nuclear particles, suitability of technetium-99 for medical imaging, background count rate and experimental error, and graphing corrected count rate versus distance. The paper also includes cooling investigation methods and sound wave topics such as pitch, reflected echoes, speed, longitudinal waves, and electromagnetic communications.","INTERNATIONAL GCSE  \nCOMBINED SCIENCE DOUBLE AWARD  \n9204/PE PHYSICS – PAPER 3 – EXTENSION PAPER  \nSpecimen material 1 hour 45 minutes  \nMaterials  \nFor this paper you must have:  \n• a ruler with millimetre measurements  \n• a calculator  \n• the Physics Equation sheet.  \nInstructions  \n• Use black ink or black ball-point pen.  \n• Fill in the boxes at the bottom of this page.  \n• Answer all questions.  \nInformation  \n• The marks for questions are shown in brackets.  \n• The maximum mark for this paper is 100.  \n\n| Please write clearly, in block capitals, to allow character computer recognition. |  |  |  |  |\n| --- | --- | --- | --- | --- |\n| Centre number |  | | Candidate number | |\n| Surname | |  |  |  |\n| Forename(s)  Candidate signature   |  |  |  |  |\n\n\n| Answer all questions in the spaces provided. |  |  |\n| --- | --- | --- |\n| 1 Atoms contain three types of particle. |  |  |\n| \u003Cbr> 0  1  .  1 \u003Cbr>\u003Cbr> 0  1  .  2  | Which particles are found in the nucleus of an atom?\u003Cbr>Tick one box.\u003Cbr>[1 mark] |  |\n|  | electrons and neutrons electrons and protons neutrons and protons protons, electrons and neutrons | |\n|  | Table 1 gives information about four radioactive isotopes.\u003Cbr>Table 1\u003Cbr>Isotope Type of radiation emitted Half-life iridium-192 gamma ray 74 days polonium-210 alpha particle 138 days polonium-213 alpha particle less than 1 second technetium-99 gamma ray 6 hours\u003Cbr>Two isotopes of polonium are given in Table 1.\u003Cbr>Compare the two isotopes of polonium in terms of the particles in their nuclei.\u003Cbr>[1 mark] |  |\n\n\n| \u003Cbr> 0  1  .  3  | A doctor injects a patient with a very small dose of technetium-99 to monitor the blood flow through the patient’s heart.\u003Cbr>The radiation detected outside of the patient’s body can be used to see if the heart is working correctly.\u003Cbr>Explain why technetium-99 is the most suitable for this use.\u003Cbr>[2 marks]\u003Cbr>\u003Cbr>Question 1 continues on the next page |\n| --- | --- |\n\n\n| \u003Cbr> 0  1  .  4 \u003Cbr>\u003Cbr> 0  1  .  5  | A teacher used the equipment shown in the diagram to measure the count rate at different distances from a radioactive source.\u003Cbr>The detector detected radiation. The number detected per minute is called the count rate.\u003Cbr>Figure 1\u003Cbr>\u003Cbr>Metre rule\u003Cbr>Her results are shown in Table 2.\u003Cbr>Table 2\u003Cbr>Distance in metres Count rate in counts per minute Corrected count rate in\u003Cbr>counts per minute 0.4 143 125 0.6 74 56 0.8 49 31 1.0 38 20 1.2 32 14 1.4 28 10 1.6 18 0 1.8 18 0 2.0 18 0\u003Cbr>Calculate, using data from Table 2 , the value of the background count rate.\u003Cbr>[1 mark]\u003Cbr>Background count rate =   counts per minute\u003Cbr>Name the type of error caused by the background count in this experiment.\u003Cbr>[1 mark] |\n| --- | --- |\n\n\n| \u003Cbr> 0  1  .  6 \u003Cbr>\u003Cbr> 0  1  .  7  | The radioactive source used in the demonstration emits only one type of radiation.\u003Cbr>How can you tell from the data in the table that the radioactive source is not an alpha emitter?\u003Cbr>[1 mark]\u003Cbr>Plot a graph of corrected count rate against distance for distances between 0.4 mand 1.4 m.\u003Cbr>Draw a line of best fit to complete the graph in Figure 2.\u003Cbr>[3 marks]\u003Cbr>Figure 2\u003Cbr>|\n| --- | --- |\n\n\n| 2\u003Cbr>\u003Cbr> 0  2  .  1  | The diagram shows three cups.\u003Cbr>A student would like to investigate the rate of cooling when each cup is filled with hot water.\u003Cbr>\u003Cbr>Write a method to perform this investigation.\u003Cbr>Include:\u003Cbr>• an equipment list\u003Cbr>• the independent variable\u003Cbr>• the dependent variable\u003Cbr>• the variables you need to control\u003Cbr>• what you will need to measure\u003Cbr>• safety issues.\u003Cbr>[6 marks] |\n| --- | --- |\n|  |  |\n\n\n| \u003Cbr> 0  2  .  2  | Complete the headings in the table of results to collect this data.\u003Cbr>[2 marks] |\n| --- | --- |\n|  |  |\n| \u003Cbr> 0  2  .  3  | The table of results above does not allow any room to take repeat readings.\u003Cbr>Suggest two reasons why it is always a good idea to repeat your experiment.\u003Cbr>[2 marks] |\n|  |  |\n\n\n| 3\u003Cbr>\u003Cbr> 0  3  .  1 \u003Cbr>\u003Cbr> 0  3  .  2 \u003Cbr>\u003Cbr> 0  3  .  3  | Bats use the reflection","cbCaihivv0oAVgr1","https://ap.wps.com/l/cbCaihivv0oAVgr1","pdf",494887,1,28,"English","en",105,"# Question 1 - Radioactive isotopes and radiation detection\n## Nuclear particles and isotope comparison\n## Technetium-99 suitability and experiment data\n## Background count rate, error, and graphing\n# Question 2 - Rate of cooling investigation method\n## Method with variables, measurements and safety\n## Table headings and reasons for repeats\n# Question 3 - Sound waves and ultrasound in echolocation\n## Pitch, reflected sound waves, speed calculation\n## Longitudinal waves and electromagnetic communication\n# Question 4 - Evaporation and cooling\n## Explaining sweat cooling and factors affecting evaporation","[{\"question\":\"What materials are required for this Physics Paper 3 extension paper?\",\"answer\":\"A ruler with millimetre measurements, a calculator, and the Physics Equation sheet are required.\"},{\"question\":\"How is background count rate determined in the radiation experiment?\",\"answer\":\"Using the corrected data from Table 2, background count rate is calculated as the value that remains when radiation from the source is effectively absent.\"},{\"question\":\"What variables must be included when writing the cooling investigation method?\",\"answer\":\"The method must include an equipment list, the independent variable, dependent variable, controlled variables, what to measure, and relevant safety issues.\"}]","International GCSE Combined Science Double Award - 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