CONFTDENTTAL *(SULIT*) A 1 I i l. / .f l' 1' 1. l : li / /t,.i; A,,i N,i4,1 1.,1 t', t,,1 A I 4 / i.J .i' {, t: i} ! A1.4/t.t,t" 1,,l}..l/;lhlt|011,'..1-t:l,l:1it/i.;,4AN^1l'Wnt',1j",4'\,1,i i';Xli,ii,,!ffffi8"t:ii',!,:'tl;i1:tr1,'iiiivi;iti'1i?.!;)Xi,i:i t*::ll;lli ffi E 'llllrLi'tii:1-fJ[\':Ny'Y,f ii'^?htEn t I[-EBL# ,3), ,,','A,1hl,','iiii','!uf,lf!!1,'MjAfiiYil YAi'i,I'i:iilfrifffiX6lllXi{jX{JFfrT,;iJtili,i'jJ# iti'd',{61'( it$ffr';fi',f);))f,I,l)jAY{i} MA/Ll.fl'}LPLR/K.r/1AN/vlAt,AY-llAMtl/l1.tPIl'[ll/K.;AANuAIAy.t/AMatustTt,t]<TkiAAN*:ialavsiA MAJLIS PEPERIKSAAN MALAYSIA (MALAYSIAN EXAMINAIIONS COI.TNCIL) SIJIL TINGGI PERSEKOLAHAN MALAYSIA (MALAYSIA HIGHER SCHOOL CERTIFICATE) Instructions to candidates: DO NOT OPEN THIS QUESTION PAPER UNTIL YOU ARE ALLOWED TO DO SO. Answer all questions in Section A. Answer all questions in Section B. Answer two questions only in Section C. All working should be shown. For numerical answers, units should be quoted wherever appropriate. Answers may be written either in English or Malay. Arahan kepada calon: JANGAN BUKA KERTAS SOALAN INI SEHINGGA ANDA DIBENARKAN BERBUAT DEMIKIAN. Jowab semua soalan dalam Bahagian A. Jctwab semua soalan dalam Bahagian B. Jawab dlua soalan sahaja dalam Bahagian C. Semua kerja hendaklah ditunjukkan. Bagi jawapan di mana-mana yang sesuai. berangka, unit hendaklah dinyatakan Jawapan boleh ditulis dalam bahasa Inggeris atau bahasa Melayu. @ Majlis Peperiksaan Malaysia 2018 srPM 2018 - 960/3 [Tirrn over (Lihat sebelah) *This question paper is CONFIDENTIAL until the examination is over. COfliffnfNTIAL* (*Kertas soalan ini SULIT sehingga peperiksaan kertas ini tamat.) (suLIT*)
CONFIDENTIAL* Section A,115 marks) Answer a!1, questions. 1 A particle performs a simple harmonic motion along the x-axis. Which graph shows the variation of acceleration, a, -of the particle with displacement, x, from the equilibrium position? 2 An extemal force is applied to a damped oscillatory system so that the system could oscillate continuously. Hence, io maintain the maximum amplitude of oscillation, the frequency of the applied force is A half of the natural frequency of the oscillatory system B double the natural frequency of the oscillatory system C equal to the natural frequency of the oscillatory system D independent of the natural, frequency of the oscillatory system 3 The intensity of wave at a point, 2.0 m from the point source is 8.8 X 10-e W m-2. What is the intensity of wave at 3.5 m from the point source? C D A 2.9xlc-gWm-2 c 1.5 X 10+Wmr B 5.0 X 10-e W m-2 D 2.7 x 10-8 W m-2 srPM 2018 - 96013 *This question paper is CONFIDENTIAT until the examination is over. 288 CONF'IDENTIAL*
CONFIDENTIAL* 4 When a particle is at a maximum displacement, a stationary wave on a shing is shown in the diagram below. If the period of oscillation is A I, which is the waveform of the stationary **" ut", f Z: B C D The speed of wave in a stretched string depends on A the length and the tension of the string B the amplitude of wave and the length of string C the amplitude of wave and the tension of the string D the tension and the mass per unit length of the string STPM 2018 - 960t3 *This question paper is CONFIDENTIAL until the examination is over. CONFIDENTIAL* 289
I CONFIDENTIAL* 6 Ali and Chong stand stationarily at P. Ali then runs away from Chong with a speed of 2.0 m. , to*r:.d, a vertical concrete wall while blowing a whistle that produces sound of frequency 500 Hz as shown in the diagram below. The sound produced directly by Ali superposed with the sound reflected by the wall. What is the beat frequency heard by Chong? [Speed of sound is 340 m s-1.] A 3Hz B 5Hz C 6Hz D 9Hz through a convex mirror with a radius of curvature, of the customer if the image of the customer is 4.5 m A shopkeeper observes a customer 20.0 m. What is the actual distance from the mirror? A 3.1 m B 3.7 rn C 5.8m D 8.2m A sphere made of a material with a refractive index 1.5 contains a small bug 1.5 cm from the centre as shown in the diagram below. Bug Given that the radius of the sphere is 4.0 cm, what is the position of the image of the bug as seen by the observer from the left of surface X? Observ A 2.1 cm to the left of surface X C 1.4 cm to the left of surface X STPM 20t8 - 96013 *This question paper is CONFIDENTIAL until B 2.1cm to the right of surface X D 1.4 cm to the right of surface X the examination is over. 290 CONF'IDENTIAL*
CONFIDENTTAL* 9 A plane-polarised light beams with intensity 16 passes through a polaroid. The angle between the transmission axis of the polaroid and the plane of polarisation is 0. Which expression shows the correct intensity of the light, d after passing through the polaroid? A t: leos2e B I:Iocos20 c r:I]"or'e D I:I2ocos20 10 A ray of light entering a fibre optics is shown in the diagram below. Outer cladding Light Which statement is not true about the fibre optics above? A The inner core is made of metal. B The inner core is denser than the outer cladding. C The angle of incidence is greater than the critical angle. D The light ray in the inner core undergoes total internal reflection. Photoelectrons emitted from a metal surface have a maximum kinetic energy which depends on A the intensity of the incident radiation B the amplitude of the incident radiation C the wavelength of the incident radiation D the area illuminated by the incident radiation which statement is not true about Bohr's atomic model for hydrogen atom? A The electrons move about the nucleus in a circular orbit. B The total energy of electron in the allowed orbit is constant. c rhe angular momentum of electrons in the allowed orbit is quantized. D The electrons radiate electromagnetic wave when they orbit the nucleus in the allowed orbit. The half-life of aradioactive isotope is 4.5 hours. If there are initially 2.00 x 1023 atoms of the isotope, the number of atoms of the isotope which decayed after 1g hours is A 1.gg x 1023 B 1.75 x ro23 c 1.50 x 1023 D 2.50 x tO22 11 L2 13 STPM 2018 - 960/i *This question paper is cONFIDENTIAL until the examination is over. 291 CONFIDENTIAL*
CONFIDENTIAL* 14 The transitions between energy levels waveiengths, Lv h and .1,3, as shown in for hydrogen atom produce three spectral lines of the diagram below. If ,i,1 and A2 are 122 A 19nm nm and 103 nm respectively, what is the value of fu? B 59nm C 225nm D 661 nm L5 The variation of binding energy per nucleon of the nucleus with nucleon number is shown in the graph below. Binding energy per nucleon (Mev) ZSA Nucleon number Which statement is true about the graph above? A Nuclides with nucleon number between 40 and 80 are less stable. B The lower the binding energy per nucleon, the more stable is the nucleus. C Nuclides with high nucleon number will split to increase its binding energy per nucleon. D Deuterium has the lowest binding energy per nucleon and undergoes fission to achieve its stability. 9- 8- n 6- 5- 4- J. 2. 1. 0 50 100 150 200 STPM 2018 - 96013 *This question paper is CONFIDENTIAL until the examination is over. 292 CONF'IDENTIAL*
CONFIDENTIALX Section B |5 marlal Answer all questions. Write the in the spa:ces provided. 16 A firecracker explodes in the air at aheight of 10.0 m vertically above a boy. The intensity level of the explosion heard by the boy is 60.0 dB. [The threshold intensity of hearing is 1.00 x 10-12 W *r.] (a) Calculate the power of sound for the explosion of the fuecracker. t4l (b) Determine the intensity level of the explosion heard by another boy which is 15.0 m from the explosion site. tll (c) Differentiate between the propagations of sound and light. STPM 2018 - 96013 *This question paper is CONFIDENTIAL until the examination is over. CONFIDENTIAL* l2l 294
CONF'IDENTIAL* I7 A proposed controlled fusion represented by process in a reactor is the Deuterium-Tritium fusion process ?u + iri -+ lH" + jn. (a) Determine the percentage of the combined mass of lU ana lU which has been converted to energy. l}l (6) Determine the energy released in the reaction. l2l (c) A city has an average power deqand of j^.2 x 10e W. If the reactor bas 35o/o effrciency, calculate the combined mass of f U and lH for 30 days. l4l [Mass or f u is2.0t4t02u; mass or ?H is 3.016050 u; mass or 1}Ie is4.002625u;mass of fn is 1.008665 u, lu = 935 MeV.l *This question paper is CONFIDENTIAL until the examination is over. CONFTDENTIAL* 295
CONFIDENTIAL* Section C [30 marl<s) Answbr two questions. You may answer all the questions btt only the first two answers will be marked. 18 (a) State three differences between progressive and standing waves. (b) The equation of a progressive wave in a stretched string is given by y:0.020 sin (4.0r - 5.0x), where x and y are measured in metre and t in second. Determine the speed of the wave. 14) (c) A standing wave is formed by the superposition of the progressive waves in (b) with the reflected wave from the ends where the string is tied. Assume there is no loss in energy. [Given that sin I + sin B : z*. (4#) '," (4*2) I (i) State the principle of superposition. (ii) Deduce an equation for the standing wave formed. (ii| Determine the amplitude of the standing wave at x : 0.45 m. (lv) Determine the minimum length of the string used. State Huygens's principle. 13l t1l t3l 12) L2l te (a) 121 (D) A monochromatic beam of wavelength 633 nm is incident perpendicularly onto a pair of slits. The separation of the slits is 12.0 pm.A series of bright and dark fringes are fonned on the screen located at a distance of2.8 m from the slits. (i) Based on the Huygens's principle, sketch a diagram to show the forrnation of wave fronts which produce bright fringes on the screen. 141 (ii) Calculate the distance between two adjacent bright and dark fi:inges, on the screen. t3l (iii) What happen to the fringe width when a shorter wavelength monochromatic source is used? tll (iv) Describe the change in fringe pattern if the beam from one slit has its phase shifted by half a wavelength relative to the beam from the other slit. tzl (v) Explain the change in the interference pattern if the experiment is carried out rn water. t3l STPM 2018 - 96013 *This question papil is CONFIDENTIAL until the examination is over. CONFIDENTIAL* 296
CONFIDENTIAL* 20 (a) (i) Explain how continuous X-ray spectrum is produced. t3l (i0 Sketch and label a typical X-ray spectra. 121 (b) In an X-ray tube, electrons are accelerated by a potential difference of 20.0 kV to hit a metal target. (D Determine the final speed of the electrons just before hitting the target. (ii) Calculate the minimum wavelength of the X-ray produced. (iii) Determine the de Broglie wavelength of the accelerated electrons. (c) The characteristic X-ray of wavelength 2.8 x 10-10 m is incident on a crystal. order diffiaction is observed at a glancing angle of 12". Determine the (i) energy of the X-ray photon, (ii) spacing between the atomic planes that caused the diffraction. 121 121 t21 A first t2) 121 STPM 2018 - 96At3 +This question paper is CONFIDENTIAL until the examination is over. 297 CONFIDENTIAL*