Cambridge International Examinations Cambridge ... - GCE … Levels/Physics (5054... · PHYSICS 5054/42 Paper 4 Alternative to Practical October/November 2015 ... Suggest one practical
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This document consists of 10 printed pages and 2 blank pages.
Paper 4 Alternative to Practical October/November 2015
1 hour
Candidates answer on the Question Paper.
No Additional Materials are required.
READ THESE INSTRUCTIONS FIRST
Write your Centre number, candidate number and name on all the work you hand in.Write in dark blue or black pen.You may use an HB pencil for any diagrams or graphs.Do not use staples, paper clips, glue or correction fluid.DO NOT WRITE IN ANY BARCODES.
Answer all questions.
Electronic calculators may be used.You may lose marks if you do not show your working or if you do not use appropriate units.
At the end of the examination, fasten all your work securely together.The number of marks is given in brackets [ ] at the end of each question or part question.
Cambridge International ExaminationsCambridge Ordinary Level
(b) The student then uses the apparatus in Fig. 1.1 to obtain an accurate value for the focal length f of the lens.
metre rulescreen
lenslens holder
illuminatedobject
light
Fig. 1.1 (not to scale)
The student places the lens a measured distance u from the illuminated object. He then adjusts the position of the screen until a clear focused image is seen on the screen. He measures the distance D from the object to the focused image on the screen.
(i) On Fig. 1.1, mark and label the lengths u and D. [2]
(ii) The distance u is set at 85.0 cm and the student measures the distance D. He repeats the experiment and obtains the following values, in cm, for D.
96.5 96.3 96.2 96.1 96.2
Calculate Dav , the average value of D. Give your answer to three significant figures.
Dav = ...................................... [1]
(iii) State one way in which the student can ensure that each measurement of D is accurate.
(c) Student C is given an electronic measuring device, as shown in Fig. 3.2. The manufacturers claim that the device is accurate to 0.5 mm and has a range of 60 m.
The device emits pulses of laser light that reflect from the opposite wall of the laboratory and return back to the device. It measures the time taken for a pulse to return.The device calculates the distance to the wall using the time taken for the pulse to return.
(i) State one piece of additional information needed by the device to calculate this distance.
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