Candidate Number. General Certificate of Education Advanced Level Examination June 2010

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1 Centre Number Surname Candidate Number For Examiner s Use Other Names Candidate Signature Examiner s Initias Genera Certificate of Education Advanced Leve Examination June 2010 Question 1 2 Mark Physics (Specifications A and B) PHA6/B6/X TOTAL Unit 6 Investigative and Practica Skis in A2 Physics Route X Externay Marked Practica Assignment (EMPA) Section A Task 1 For this paper you must have: a cacuator a penci a ruer. Instructions Use back ink or back ba-point pen. Fi in the es at the top of this page. Answer a questions. You must answer the questions in the spaces provided. outside the around each page or on bank pages. Show a your working. Do a rough work in this book. Cross through any work you do not want to be marked. Information The marks for questions are shown in brackets. The maximum mark for Section A Task 1 is 15. (JUN10PHA6B6X01) WMP/Jun10/PHA6/B6/X PHA6/B6/X

2 2 Section A Task 1 Foow the instructions given beow. Answer a the questions in the spaces provided. No description of the experiment is required. 1 You are to investigate the sma-ampitude osciations of a chain, suspended from one end, in a vertica pane. 1 (a) You are provided with three short chains, each consisting of eight paper cips joined together. One end of each chain has a sma white mark painted on it to show the end from which it shoud be suspended. Suspend one chain from the horizontay-camped support so that the chain hangs freey in a vertica pane. The white mark shoud be at the point of suspension of this chain. Dispace the ower end then reease the chain so that it performs sma-ampitude osciations in a vertica pane, as shown in Figure 1. Figure 1 end of chain with sma white mark painted on it suspended from horizontay-camped support direction of osciation WMP/Jun10/PHA6/B6/X

3 3 1 (a) (i) Make and record suitabe measurements to cacuate the period, T 1, of the osciations of this chain. You shoud use a fiducia mark to assist in making these measurements. T 1 =... 1 (a) (ii) Connect one of the other chains to the ower end of the suspended chain, thereby doubing the number of inter-connected paper cips. The white mark on the ower chain shoud be at the point of suspension to the upper chain. Repeating the procedure as before, make and record suitabe measurements to cacuate the period, T 2, of the osciations of this chain T 2 =... 1 (a) (iii) Connect the remaining chain to the ower end of the suspended chain, thereby suspending a the paper cips in a singe chain. The white mark on the ower chain shoud be at the point of suspension to the upper chain. Repeating the procedure as before, make and record suitabe measurements to cacuate the period, T 3, of the osciations of this chain..... T 3 =... (3 marks) Question 1 continues on the next page WMP/Jun10/PHA6/B6/X Turn over

4 4 1 (b) It is suggested that n, the number of suspended paper cips is reated to T, the period of the paper cip chain by an expression of the form n T x where x is an integer. With the aid of the grid provided or otherwise, use the resuts that you obtained in part (a) to determine the vaue of x. x =... (4 marks) WMP/Jun10/PHA6/B6/X

5 5 1 (c) A student caims that T can be cacuated in the same manner as the period of a simpe penduum of ength equa to that of the chain. Show that the student s caim is fase. (2 marks) 9 Turn over for the next question WMP/Jun10/PHA6/B6/X Turn over

6 6 2 You are provided with two identica penduums couped to each other by thread from which four paper cips have been suspended. 2 (a) Dispace the bob of the eft-hand penduum about 5 cm eftwards, keeping the string in the vertica pane defined by the rest position of the penduums. Reease the bob and observe the subsequent motion of both penduums; you wi see that the ampitude of the eft-hand penduum graduay decreases and the ampitude of the right-hand penduum increases. After a certain time has eapsed, the eft-hand penduum briefy comes to rest and the right-hand penduum swings with maximum ampitude, then the transfer of energy between the penduums reverses unti the right-hand penduum is once again at rest and the eft-hand penduum swings with maximum ampitude. Make suitabe measurements to cacuate the time, τ, for the ampitude of either penduum to increase from zero to a maximum and then fa to zero again. Labes, on which you may write, have been paced on the edge of the bench to assist you in making these measurements. τ =... (1 mark) 2 (b) It is suggested that τ may be inversey proportiona to the number of paper cips suspended from the thread. 2 (b) (i) Make measurements to cacuate τ with five paper cips suspended from the thread. τ =... 2 (b) (ii) Make additiona measurements to cacuate τ with six paper cips suspended from the thread. τ =... WMP/Jun10/PHA6/B6/X

7 7 2 (b) (iii) Expain whether your resuts from parts (a) and (b) show that τ is inversey proportiona to the number of paper cips suspended from the thread. (4 marks) 2 (c) Expain one difficuty that might be encountered if you were to make measurements to determine τ with ess than four paper cips suspended from the thread. (1 mark) 6 END OF QUESTIONS WMP/Jun10/PHA6/B6/X

9 Centre Number Surname Candidate Number For Examiner s Use Other Names Candidate Signature Examiner s Initias Genera Certificate of Education Advanced Leve Examination June 2011 Question 1 2 Mark Physics PHA6/B6/XPM1 (Specifications A and B) TOTAL Unit 6 Investigative and Practica Skis in A2 Physics Route X Externay Marked Practica Assignment (EMPA) Section A Part 1 For this paper you must have: a cacuator a penci a ruer. Instructions Use back ink or back ba-point pen. Fi in the es at the top of this page. Answer a questions. You must answer the questions in the spaces provided. outside the around each page or on bank pages. Show a your working. Do a rough work in this book. Cross through any work you do not want to be marked. Information The marks for questions are shown in brackets. The maximum mark for Section A Part 1 is 15. (JUN11PHA6B6XPM101 WMP/Jun11/PHA6/B6/XPM1 PHA6/B6/XPM1

10 2 Section A Part 1 Foow the instructions given beow. Answer a the questions in the spaces provided. No descriptions of the experiments are required. 1 You are to investigate how the ampitude of a simpe penduum diminishes as its energy becomes absorbed by the surrounding air. A gof ba is suspended from a string to form a simpe penduum. Do not adjust the ength of the penduum or the height above the foor of the camped end of the thread. Put the ruer on the foor with the graduated face uppermost. Pace the brick on the ruer so the smaest surface of the brick is in contact with the ruer and a smooth vertica face of the brick faces the gof ba. This nearest face of the brick shoud be 30.0 cm from the gof ba, as shown in Figure 1. The axis of the ruer shoud be parae to the edge of the bench and the zero graduation directy beow the edge of the gof ba cosest to the brick. Figure 1 ruer parae to the edge of the bench view from directy above gof ba brick with smaest surface resting on the ruer zero graduation of the ruer 30.0 cm graduation of the ruer foor view from the side WMP/Jun11/PHA6/B6/XPM1

11 3 1 (a) Keeping the string straight, pu the gof ba to one side, so it touches the brick. Reease the gof ba so that it performs simpe harmonic motion in a vertica pane, directy above the ruer. 1 (a) (i) Record in the tabe beow, A n, the ampitude of the osciation of the gof ba after n osciations have been competed; use the vaues n = 10, 20 and 30 indicated in the tabe. The tabe has been party competed for you. Use the additiona coumns in the tabe as required, to record repeated measurements. A n the ampitude of the penduum after n osciations n A n /cm A n /cm mean A n /cm (a) (ii) Determine the mean vaue of A n after 10, 20 and 30 osciations of the penduum. Record these data in the right-hand coumn of the tabe. 1 (a) (iii) Use your data to cacuate Δ A 10, the uncertainty in A 10, the ampitude after 10 osciations. Δ A 10 =... (2 marks) Question 1 continues on the next page WMP/Jun11/PHA6/B6/XPM1 Turn over

12 4 1 (b) Textbooks suggest that under certain conditions the ampitude of a simpe penduum subject to air damping shoud decrease exponentiay. A teacher says that if the suggestion is correct, then A n A n+10 = constant. Perform suitabe cacuations with your data from part (a) to test the teacher s idea. State and expain your concusion. (2 marks) 1 (c) Using the same apparatus as in part (a), a student designs a different experiment in which energy is absorbed. The apparatus is to be arranged as shown in Figure 2 so that when at the equiibrium position, the gof ba rests against the brick. The ruer is parae to the bench and perpendicuar to the brick. The graduated face of the ruer is uppermost with the zero graduation in contact with the brick. Figure 2 brick with smaest surface resting on the foor zero graduation of the ruer 30 cm graduation of the ruer foor WMP/Jun11/PHA6/B6/XPM1

13 5 Keeping the ba verticay above the ruer and the string straight, the gof ba is pued to one side unti dispaced 30.0 cm horizontay and then reeased so it swings back to strike the brick. A student intends to measure B, the ampitude of the osciation of the gof ba after it has rebounded from the brick and intends to investigate whether the ampitude of the osciation of the gof ba decreases exponentiay. The student intends to check this by cacuating B n B n+1, where B n is the ampitude after striking the brick n times, and B n+1 is the ampitude after striking the brick (n + 1) times. Use the apparatus provided for part (a) to try out the student s idea and hence identify two difficuties in the procedure. First difficuty... Second difficuty... (2 marks) 6 WMP/Jun11/PHA6/B6/XPM1 Turn over

14 7 2 You are to measure the output votage of a soar ce as the intensity of ight incident on it is varied by passing the ight through two identica poarising fiters. The genera arrangement and method of assemby is shown in top and side view in Figure 3. Figure 3 top view method of assemby (view from above) tape soar ce mounted on top of cyindrica tube side view soar ce mounted on top of fiter F1 fiter F1 paced on soar ce fixed to bench fiter F1 taped to soar ce Fiter F1 has been taped to the surface of the soar ce that is sensitive to ight. The ce has been mounted on a which has been fixed to the bench. A cyindrica tube has been paced around this arrangement to shied it from unwanted ight. Pace the circuar scae centray on top of the cyindrica tube with the printed side uppermost and fix this to the tube using Bu-Tack. Position the camped ight source so that the amp is directy above the hoe in the circuar scae. Do not adjust the height of the amp or the output votage of the power suppy. The fiter F2 has been mounted between two pieces of circuar card. 2 (a) (i) Position this card centray on the circuar scae so that θ, the direction of the arrow = 0. Switch on the amp then read and record the votmeter reading V 0. V 0 =... Question 2 continues on the next page WMP/Jun11/PHA6/B6/XPM1 Turn over

15 8 2 (a) (ii) Keeping the card centray on the scae, increase θ in 20 steps to obtain further vaues of V to compete the tabe. Switch off the amp once you have competed these measurements. θ / V /mv θ / V /mv θ / V /mv (1 mark) 2 (b) Adding a suitabe scae to the vertica axis, pot on the grid on page 9 a graph of your resuts from part (a)(ii). (2 marks) 2 (c) (i) Read from your graph, and record beow, V max and V min, the maximum and minimum vaues of V. V max =... V min =... 2 (c) (ii) Hence estimate the ampitude, A, of the variation V with θ. A =... 2 (c) (iii) Identify and expain from your graph any vaue of θ for which the experimenta arrangement is most sensitive to changes in θ. (3 marks) WMP/Jun11/PHA6/B6/XPM1

16 9 V / mv θ / WMP/Jun11/PHA6/B6/XPM1 Question 2 continues on the next page Turn over

17 10 2 (d) A student performs the experiment but fais to keep the edge of the card containing the fiter F2 centray on the circuar scae. 2 (d) (i) State and expain the effect this may have on the readings of V. 2 (d) (ii) State one procedure that the student coud take so that this error can be avoided. (3 marks) 9 END OF SECTION A PART 1 WMP/Jun11/PHA6/B6/XPM1

19 Centre Number Surname Candidate Number For Examiner s Use Other Names Candidate Signature Examiner s Initias Genera Certificate of Education Advanced Leve Examination June 2012 Question 1 2 Mark Physics (Specifications A and B) PHA6/B6/XPM1 TOTAL Unit 6 Investigative and Practica Skis in A2 Physics Route X Externay Marked Practica Assignment (EMPA) Section A Part 1 For this paper you must have: a cacuator a penci a ruer. Instructions Use back ink or back ba-point pen. Fi in the es at the top of this page. Answer a questions. You must answer the questions in the spaces provided. outside the around each page or on bank pages. Show a your working. Do a rough work in this book. Cross through any work you do not want to be marked. Information The marks for questions are shown in brackets. The maximum mark for Section A Part 1 is 16. WMP/Jun12/PHA6/B6/XPM1 PHA6/B6/XPM1

20 3 Section A Part 1 Foow the instructions given beow. Answer a questions in the spaces provided. No descriptions of the experiments are required. 1 You are to measure the radius of curvature, R 1, of the concave surface of a spherica mirror by measuring the period of a ba bearing roing on the mirror. 1 (i) Use the micrometer screw gauge to make suitabe measurements to determine the radius, r, of the ba bearing... r =... (2 marks) 1 (ii) Pace the mirror on top of the empty beaker with the concave surface uppermost. Pace the ba bearing near the edge of the mirror so that when reeased, the ba bearing performs osciations about the centre of the mirror, as shown in Figure 1. Figure 1 ba bearing mirror with concave surface uppermost empty beaker Make suitabe measurements to determine the mean period, T 1, of the osciations. You may mark the inside of the mirror with a penci to assist you with the measurement. T 1 =... (1 mark) WMP/Jun12/PHA6/B6/XPM1 Turn over

21 4 1 (iii) It can be shown that T 1 is given by T 1 = 2π 7(R 1 r) 5g where g = 9.81 N kg 1. Using your vaues of r and T 1, determine R 1. R 1 =... (2 marks) WMP/Jun12/PHA6/B6/XPM1

22 5 1 (iv) A student is provided with a seection of ba bearings of different dimensions. Using each of these in turn, the student obtains vaues of T 1 for each corresponding vaue of r. The student then produces the graph of T 1 2 against r shown in Figure 2. Figure 2 T 1 2 / s r/mm State and expain how the vaue of R 1 can be obtained from this graph. (3 marks) 8 Turn over for next question WMP/Jun12/PHA6/B6/XPM1 Turn over

23 6 2 You are to measure the radius of curvature, R 2, of the convex surface of the mirror by measuring the period of an osciating metre ruer paced on the top of the mirror. Pace the mirror on top of the empty beaker with the convex surface uppermost. Pace the metre ruer, with the graduated face uppermost, on top of the mirror so that the ruer is parae to the surface of the bench. Sighty depress one end of the ruer then reease it so that the ruer performs sma-ampitude osciations, as shown in Figure 3. Figure 3 mirror with the convex surface uppermost empty beaker mode of osciation of the metre ruer 2 (i) Using the additiona equipment provided, assembe a suitabe fiducia mark, then make suitabe measurements to determine the mean period, T 2, of the osciations. T 2 =... (1 mark) 2 (ii) If the thickness of the ruer is much ess than its ength, it can be shown that 2 1 xπ R 2, 3g( T 2 ) where x = the ength of the ruer and g = 9.81 N kg 1. Using your vaue of T 2, determine R 2. R 2 =... (1 mark) WMP/Jun12/PHA6/B6/XPM1

24 7 2 (iii) Show with the aid of a sketch where you positioned the fiducia mark in order to reduce uncertainty in the measurement of T 2. Expain why you chose this position for the fiducia mark. (2 marks) 2 (iv) To determine T 2, a student makes five measurements of the time for 20 osciations of the ruer. The student s data are as foows: 20T 2 /s The student uses these data to determine T 2. Cacuate the percentage uncertainty in the student s resut. (2 marks) WMP/Jun12/PHA6/B6/XPM1 Turn over

25 8 2 (v) It is reasonabe to assume that your resut for R 2 is simiar to, but not the same, as that obtained for R 1. Give two reasons why you woud not expect these resuts to be the same. Reason 1... Reason 2... (2 marks) 8 END OF QUESTIONS Copyright 2012 AQA and its icensors. A rights reserved. WMP/Jun12/PHA6/B6/XPM1

27 Centre Number Surname Candidate Number For Examiner s Use Other Names Candidate Signature Examiner s Initias Genera Certificate of Education Advanced Leve Examination June 2013 Question 1 2 Mark Physics (Specifications A and B) PHA6/B6/XPM1 TOTAL Unit 6 Investigative and Practica Skis in A2 Physics Route X Externay Marked Practica Assignment (EMPA) Section A Task 1 For this paper you must have: a cacuator a penci a ruer. Instructions Use back ink or back ba-point pen. Fi in the es at the top of this page. Answer a questions. You must answer the questions in the spaces provided. outside the around each page or on bank pages. Show a your working. Do a rough work in this book. Cross through any work you do not want to be marked. Information The marks for questions are shown in brackets. The maximum mark for Section A Task 1 is 16. WMP/Jun13/PHA6/B6/XPM1 PHA6/B6/XPM1

28 2 Section A Task 1 Foow the instructions given beow. Give the information required in the spaces provided. No descriptions of the experiments are required. 1 You are to perform two experiments invoving the vertica osciations of a spring-mass system. 1 (a) You are provided with a retort stand fitted with a camp from which a spring is suspended. A metre ruer has been camped verticay aongside the spring. Do not adjust the positions of the camps to which the spring and the metre ruer are attached. You are aso provided with masses abeed M 1 and M 2. 1 (a) (i) Attach M 1 to the ower end of the spring. Record r 1, the metre ruer reading which is at the same horizonta eve as the bottom of M 1 when M 1 is in equiibrium. r 1 =... 1 (a) (ii) Dispace and then reease M 1 so that it performs sma ampitude vertica osciations. Make suitabe measurements to determine T 1, the time period of the osciations. A fiducia mark has been provided for your use.... T 1 =... 1 (a) (iii) Add M 2 to the mass aready on the spring. Record r 2, the metre ruer reading which is at the same horizonta eve as the bottom of M 1 when in equiibrium. r 2 =... 1 (a) (iv) Dispace and then reease the mass on the spring and make suitabe measurements to determine T 2, the time period of the osciations.... T 2 =... (2 marks) WMP/Jun13/PHA6/B6/XPM1

29 3 1 (b) Evauate r 2 r 1 (T 2 T 1 ) (T 2 +T 1 ) r 2 r 1 (T 2 T 1 ) (T 2 +T 1 ) =... (2 marks) 1 (c) Expain how you reduced uncertainty in your readings of r 1 and r 2. You may use a sketch to iustrate your answer. (2 marks) WMP/Jun13/PHA6/B6/XPM1 Turn over

30 4 Dismante your apparatus and pace M 1, M 2, and the spring to one side. Inform the Supervisor that you require the additiona apparatus to compete part (d) of this question. 1 (d) You are provided with an additiona retort stand to which a camp has been attached. Adjust the height of camps on each retort stand so the horizonta arms of these camps ie in the same horizonta pane, about 10 cm above the eve of the bench. Position the stands so that the arms of the camps project over the edge of the bench, as shown in the side view in Figure 1. Figure 1 metre ruer resting on horizonta arm of camps positioned at 10 cm and 90 cm graduations on ruer bench eve horizonta arm of camp projecting over edge of bench springs suspended by oops of string positioned at 40 cm and 60 cm graduations side view front view Join the springs to the metre ruer using the oops of string fastened at one end of each spring, then pace the ruer, with the graduated face uppermost, on the projecting arms of the camps. Adjust the position of the stands unti the ruer is supported at the 10 cm and 90 cm graduations. Move the oops of string so that the springs are positioned beow the 40 cm and 60 cm graduations. You are provided with masses M 3 and M 4. Attach M 3 to the ower end of the spring suspended beow the 40 cm graduation and attach M 4 to the ower end of the spring suspended beow the 60 cm graduation. WMP/Jun13/PHA6/B6/XPM1

31 5 With M 4 hed at rest at the equiibrium position, dispace M 3 verticay downwards through approximatey 5 cm. Reease both masses simutaneousy so that M 3 performs sma-ampitude vertica osciations. 1 (d) (i) Observe and describe the subsequent motions of M 3 and M 4, with particuar reference to the ampitude variations and phase reationship between the motions of the masses. 1 (d) (ii) Make suitabe measurements to determine τ, the time for the energy of M 3 to transfer to M 4 and then back again. τ =... (4 marks) 10 TURN OVER FOR NEXT QUESTION WMP/Jun13/PHA6/B6/XPM1 Turn over

32 6 2 You are to investigate how the magnetic fux density varies between two bar magnets. You are provided with a metre ruer and a haf-metre ruer. Pace the ruers with their argest faces in contact with the bench then use the compass, together with the set-square, to position the ruers with the aignment shown in Figure 2. Figure 2 N zero graduation on the haf-metre ruer W S E zero graduation on the metre ruer intersection of centre ines of ruers Pace the compass at the intersection of the centre ine of the ruers. Make any further sma adjustment to the direction of the ruers that may be necessary so that the neede is aigned with the centre ine of the haf-metre ruer. Once in position the ruers shoud be taped to the bench. Pace a bar magnet on the metre ruer with the north-seeking poe at approximatey the 400 mm graduations. The north-seeking poe of this magnet shoud point eastwards. The magnet shoud be aigned with the centre ine of the metre rue, as shown in Figure 3. Figure 3 N magnet with the north-seeking poe at approximatey the S 400 mm graduation compass paced at the intersection of the centre ines of the ruers W E N WMP/Jun13/PHA6/B6/XPM1

33 7 Pace the other bar magnet at about the mid-point of the haf-metre ruer with the north-seeking poe of the magnet pointing eastwards. The centre of this magnet shoud ie directy above the centre ine of the haf-metre ruer. Move this magnet directy towards the compass unti the neede points due north again. 2 (a) (i) Measure and record in Tabe 1 beow, the distances x and y 1 defined in Figure 4. Figure 4 N W E S N y 1 N 2 (a) (ii) Maintaining their orientation, interchange the positions of the two magnets. With the same x vaue as before, adjust the position of the other magnet unti the compass once again points due north. Measure and record in Tabe 1 y 2, the distance corresponding to y 1 in Figure 4 when the magnets are interchanged. 2 (a) (iii) Cacuate and record y, the mean vaue of the distances y 1 and y 2. 2 (a) (iv) Repeat the procedure for three arger vaues of x to compete Tabe 1. x Tabe 1 x /mm y 1 /mm y 2 /mm y /mm (2 marks) WMP/Jun13/PHA6/B6/XPM1 Turn over

34 8 2 (b) Add suitabe scaes to the grid beow and pot a graph to show how y varies with x. y / mm x / mm (2 marks) 2 (c) Determine the gradient, G, of your graph. G =... END OF QUESTIONS (2 marks) 6 Copyright 2013 AQA and its icensors. A rights reserved. WMP/Jun13/PHA6/B6/XPM1

(Specifications A and B)

(Specifications A and B) Centre Number Surname Candidate Number For Examiner s Use Other Names Candidate Signature Examiner s Initias Genera Certificate of Education Advanced Subsidiary Examination June 2011 Question 1 2 Mark