
	Trending ▼ ICSE CBSE 10th ISC CBSE 12th CTET GATE UGC NET Vestibulares ResFinder

GCE JAN 2010 : AS 2 Waves, Photons and Medical Physics - Revised

20 pages, 43 questions, 0 questions with responses, 0 total responses,

	gce	+Fave Message
	Profile Timeline Uploads Q & A

Home > gce >

Instantly get Model Answers to questions on this ResPaper. Try now!
NEW ResPaper Exclusive!

Formatting page ...

Sp N ec e i w ca tio n Centre Number 71 Candidate Number ADVANCED SUBSIDIARY General Certificate of Education January 2010 Physics assessing Module 2: Waves, Photons and Medical Physics AY121 Assessment Unit AS 2 [AY121] MONDAY 18 JANUARY, AFTERNOON TIME 1 hour 30 minutes. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number in the spaces provided at the top of this page. Answer all questions. Write your answers in the spaces provided in this question paper. For Examiner s use only Question Marks Number 1 INFORMATION FOR CANDIDATES The total mark for this paper is 75. Quality of written communication will be assessed in question 2. Figures in brackets printed down the right-hand side of pages indicate the marks awarded to each question. Your attention is drawn to the Data and Formulae Sheet which is inside this question paper. You may use an electronic calculator. 2 3 4 5 6 7 8 9 10 Total Marks 5366 1 (a) Fig. 1.1 shows graphs of displacement against time for two waves A and B. Examiner Only Marks Remark Displacement/cm 4 Wave A 2 0 2 4 6 8 10 Time/ms Wave B 2 4 Fig 1.1 (i) State the amplitude of A. Amplitude = ___________ cm [1] (ii) Calculate the frequency of Wave A. Frequency = _____________ Hz 5366 [2] 2 [Turn over (b) Are the graphs in Fig. 1.1 useful in classifying the waves as transverse? Explain your answer. Examiner Only Marks Remark _______________________________________________________ _______________________________________________________ _____________________________________________________ [1] (c) (i) Waves A and B are not in phase. Explain what is meant by in phase. ___________________________________________________ ___________________________________________________ _________________________________________________ [1] (ii) What is the phase difference between wave A and wave B? Phase difference = ________ 5366 [3] 3 [Turn over Where appropriate in this question you should answer in continuous prose. You will be assessed on the quality of your written communication. 2 Examiner Only Marks Remark Describe an experiment to determine the focal length of a converging lens. Your description should include (a) a fully labelled diagram of the apparatus you intend to use, [1] (b) an outline of the method employed, [3] (c) the results to be taken, [1] (d) an analysis of how the results can be used to obtain a value of the focal length of the converging lens. [2] Quality of written communication [2] _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ 5366 4 [Turn over _______________________________________________________ Examiner Only Marks Remark _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ 5366 5 [Turn over 3 Fig. 3.1 shows the outline ABCD of a rectangular block made of glass of refractive index 1.46. A Examiner Only Marks Remark D 41.4 75.0 B C Fig. 3.1 A ray of light is incident at an angle of incidence of 75.0 on side AB. The angle of refraction for this ray is 41.4 . The refracted ray meets face AD. (a) Calculate the angle of incidence of this ray when it meets face AD. Angle of incidence = ____________ [1] (b) Calculate the critical angle for a ray in this glass meeting the glass/air boundary. (Reminder: the refractive index of the glass is 1.46.) Critical angle = ____________ 5366 [2] 6 [Turn over (c) Use your answers to (i) and (ii) to deduce what will happen to the ray when it meets face AD. Examiner Only Marks Remark _____________________________________________________ [1] (d) On Fig. 3.1, continue the path of the ray until it has left the glass block. 5366 7 [1] [Turn over 4 Monochromatic light is incident on a narrow slit S1 as shown in Fig. 4.1. After passing through S1 the light falls on the narrow slits S2 and S3. On passing through the slits S2 and S3 there is interference in the region beyond. Examiner Only Marks Remark S2 S1 S3 Screen Fig. 4.1 (a) (i) Explain the meaning of the term interference. ___________________________________________________ _________________________________________________ [1] (ii) What essential condition must exist for an interference pattern? ___________________________________________________ _________________________________________________ [1] (iii) What other condition should exist for there to be a good contrast between the bright and dark fringes in the pattern? ___________________________________________________ ___________________________________________________ _________________________________________________ [1] 5366 8 [Turn over (b) The screen is now moved closer to the slits so that the distance between the screen and the slits S1 and S2 is half its previous value. State and explain two differences between the interference pattern now observed on the screen and the original pattern. 1. Examiner Only Marks Remark Difference ___________________________________________ Explanation _________________________________________ ___________________________________________________ ___________________________________________________ 2. Difference ___________________________________________ Explanation _________________________________________ ___________________________________________________ _________________________________________________ [4] 5366 9 [Turn over 5 At point X, 20 m from a loudspeaker the intensity of the sound is 9.9 10 5 Wm 2. Examiner Only Marks Remark (a) Calculate the sound intensity level at X. Intensity level = ________________ dB [3] (b) Sound from the loudspeaker is now amplified. This increases the sound intensity level at X by 6.0 dB from the value obtained in (a). (i) Calculate the new sound intensity level at X. Intensity level = ________________ dB [1] (ii) Calculate the corresponding factor by which the sound intensity at X is increased. Factor = ________________ 5366 [2] 10 [Turn over 6 A student carries out an experiment to find the speed of sound in air using a resonance tube. The experimental setup is shown in Fig. 6.1. Examiner Only Marks Remark Speaker Signal generator Resonance tube Water Fig. 6.1 The student sets the dial of the signal generator at 200 Hz and switches on the generator. (a) Briefly describe the procedure which must be adopted by the student in order to obtain the first position of resonance. _______________________________________________________ _______________________________________________________ _______________________________________________________ _______________________________________________________ _____________________________________________________ [2] 5366 11 [Turn over (b) (i) If the length of the air column for the first position of resonance is found to be 38 cm, calculate the speed of sound in air. Speed of sound _____________ m s 1 Examiner Only Marks Remark [3] (ii) Explain why it would be good experimental practice for the student to repeat the experiment for other frequencies. ___________________________________________________ ___________________________________________________ _________________________________________________ [1] (iii) To obtain a second frequency the student adjusts the setting on the signal generator. Unfortunately he adjusts the wrong dial on the signal generator and turns a dial which multiplies the frequency value by ten. Explain why this would make it difficult to take a reading for the first position of resonance. ___________________________________________________ ___________________________________________________ _________________________________________________ [2] 5366 12 [Turn over 7 Ultrasound can be used in non-invasive examinations of internal structures of the human body. One such investigation uses ultrasonic A scans to measure the thickness of a bone. A pulse of ultrasound is partially reflected at the front surface of the bone and then again at the back surface of the bone. The pulse echoes from the bone are converted into electrical signals which are displayed on a CRO screen. The resulting output on the CRO screen is shown in Fig 7.1 where the pulse labelled X is for the first reflection and Y is for the second reflection. Examiner Only Marks Remark X Y 8 cm Fig. 7.1 The time base on the CRO is set to 1 s per cm. (a) (i) Explain why the pulse X is of greater amplitude than pulse Y. ___________________________________________________ ___________________________________________________ _________________________________________________ [2] (ii) If the speed of ultrasound in bone is 4000 m s 1, calculate the thickness of the bone. Thickness = ___________ cm 5366 [3] 13 [Turn over (b) Another type of ultrasound scan employed in imaging is the twodimensional B scan. Examiner Only Marks Remark (i) State two ways in which the technique for the B scan differs from that of the A scan. ___________________________________________________ ___________________________________________________ _________________________________________________ [2] (ii) Describe very briefly one medical use of the B scan and what information can be gained from the procedure. ___________________________________________________ ___________________________________________________ _________________________________________________ [2] 5366 14 [Turn over 8 When electromagnetic radiation of a certain wavelength is incident on a clean metal surface, photoelectrons are emitted. Examiner Only Marks Remark (a) Explain why the photoelectrons are given off. _______________________________________________________ _____________________________________________________ [2] (b) The work function of the metal is 1.85 eV. (i) Explain the meaning of the term work function. ___________________________________________________ _________________________________________________ [2] (ii) Convert this value of the work function into joules. Work function = _________________ J [1] (iii) Calculate the minimum frequency of incident radiation for photoelectrons to be emitted. Frequency = _________________ Hz 5366 15 [2] [Turn over 9 The electron in a particular hydrogen atom is in the ground state. It can be excited to a higher energy level by absorbing energy from incident radiation of suitable wavelength. Examiner Only Marks Remark (a) (i) What is an energy level? ___________________________________________________ _________________________________________________ [1] (ii) Explain what is meant by in the ground state . ___________________________________________________ _________________________________________________ [1] (b) Fig. 9.1 shows the lowest two energy levels for the hydrogen atom. 3.34 eV 13.6 eV Fig. 9.1 (i) Explain why the energy levels are negative. ___________________________________________________ ___________________________________________________ ___________________________________________________ _________________________________________________ [2] 5366 16 [Turn over (ii) Calculate the wavelength of the incident radiation which will excite the electron in the ground state to the next energy level. Wavelength = ________________ m Examiner Only Marks Remark [3] (c) Explain why hydrogen does not absorb visible light when its electron is in the ground state. _______________________________________________________ _____________________________________________________ [2] 5366 17 [Turn over 10 Electromagnetic wave phenomena can be explained by the wave model, the photon model or both. Examiner Only Marks Remark (a) State one phenomenon, other than diffraction, which can only be explained by the wave model. ________________________ [1] (b) (i) Electron diffraction shows that electrons can behave as waves. Describe how this can be demonstrated experimentally. The space below is for any diagram you may choose to draw to aid your description. ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ _________________________________________________ [3] (ii) Describe and explain the effect on the electron diffraction pattern if the incident electrons have a smaller velocity. ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ _________________________________________________ [3] 5366 18 [Turn over THIS IS THE END OF THE QUESTION PAPER Permission to reproduce all copyright material has been applied for. In some cases, efforts to contact copyright holders may have been unsuccessful and CCEA will be happy to rectify any omissions of acknowledgement in future if notified. 5366

Formatting page ...

Additional Info : Gce Physics January 2010 Assessment Unit AS 2, Module 2: Waves, Photons and Medical Physics - Revised
Tags : General Certificate of Education, A Level and AS Level, uk, council for the curriculum examinations and assessment, gce exam papers, gce a level and as level exam papers , gce past questions and answer, gce past question papers, ccea gce past papers, gce ccea past papers

gce chat

Horizontal lines at:
Guest Horizontal lines at:
AutoRM Data:
Box geometries: