4 11232.03 Question 2 Requirements • Wooden metre-rule 1 • Light box/ray box 1 • Constructed illuminated object (washer with internal diameter 10mm) and crosswires as used in 2011 A2 3 shown in Fig. 2.1. 1 • Lens holder 1 • Screen (plain white screen) 1 • Converging lens, f = 15cm 1 5 11232.03 Illuminated object (washer and cross) construction Measure the height H of the centre of the lens, mounted in the lens holder above the surface of the bench. Take a sheet of stiff card and use a sharp knife to cut a square aperture of side 40mm so that the centre of the square is a distance H from the marked edge of the card. The width W of the card depends on the dimensions of the lens holder. Cut a piece of tracing or greaseproof paper about 60mm square. In the centre of this square use a fine felt tip pen (of similar) to mark an “X” with the arms at least 10mm long. Place the washer over the “X” so that the intersection of the arms is at the centre of the circular hole in the washer. Using transparent self-adhesive tape, attach the washer to the tracing paper. Avoid covering any part of the hole in the washer. Place the tracing paper on the card so that the washer is at the centre of the 40mm square aperture, with the washer inside the opening. Tape the tracing paper to the cardboard. The completed object is illustrated in Fig. 2.1. Fig. 2.1 Washer and “X” object (not to scale) Preparation The metre-rule should be secured to the desk with the light box secured to the 0cm mark. The lens should be placed in the lens holder in an upright position. The lens holder and screen should be placed along the metre-rule. Check that for a screen position of 650mm from the object clear images are visible at approx. 360mm and 280mm Before the Examination The object and lens should be aligned so that an image is visible on the screen. Place the screen at the 50cm mark. Action at Changeover Ensure the rule and light box are fixed in their positions. Replace the screen at the 50cm mark and ensure the lens is upright in its holder. × tracing paper 60mm × 60mm aperture 40mm × 40mm washer 10mm internal diameter 61 mm cardboard marked edge tape H W 6 11232.03 7 11232.03 8 11232.03 11232.04 ADVANCED General Certificate of Education 2018 APPARATUS AND MATERIALS LIST Physics Assessment Unit A2 3A Practical Techniques and Data Analysis [APH31] WEDNESDAY 9 MAY, MORNING New Specifi cation 2 11232.04 PHYSICS UNIT 3 (A2 3A) APPARATUS AND MATERIALS REQUIRED FOR PRACTICAL ASSESSMENT CONFIDENTIAL This document gives preliminary information on the apparatus and materials required for the A2 Practical Assessment. Information about the apparatus and materials required for this assessment must NOT be communicated to students. If apparatus/materials have their serial code and/or manufacturer specifi ed then it is essential that centres use this exact apparatus/material. On receipt of this APPARATUS AND MATERIALS LIST, centres must contact Gavin Gray, ggray@ccea.org.uk immediately if they have difficulty in sourcing the specified apparatus or materials. Teachers will be given detailed instructions for setting up the experiment in the Confi dential Instructions for Physics Practical Test, to which they will have confi dential access from April 2018. Teachers will have confi dential access to a copy of the experimental test two working days (48 hours) before the start of the assessment. The A2 3 Practical Techniques Assessment is a test of practical skills consisting of two experimental tests (40 marks). The duration of the assessment is 1 hour. The apparatus in the following list will allow for one experiment to be set up for the practical test which makes up questions 1–2. In other words, each set of apparatus (as listed on page 3) will accommodate two candidates when doing the circus of experiments. The apparatus can be used for alternative sessions according to the following schedule: 9 May 2018 Physics A2 3A (APH31) (Main Session) 9.15 am–10.15 am (First Alternative) 10.30 am–11.30 am (Second Alternative) 11.45 am–12.45 pm (Third Alternative) 1.15 pm–2.15 pm (Fourth Alternative) 2.30 pm–3.30 pm One set of apparatus for A2 3A (APH31) will therefore be suffi cient for ten candidates on 9 May if the Main Session and all four alternatives are used. A laboratory may contain one, two, three or more sets of apparatus. This means that two, four, six, eight or more candidates can be accommodated in the same session. To maintain the confi dentiality of details of the practical tests, candidates entered for any of the alternative sessions must be segregated within the centre so that there can be no contact with candidates who have taken an earlier test in any centre. IMPORTANT NOTICE Centres are urged to order items needed for the Physics Practical Test from the suppliers as soon as possible.