# PHYA1. General Certificate of Education Advanced Subsidiary Examination June Particles, Quantum Phenomena and Electricity

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1 Centre Number Surname Candidate Number For Examiner s Use Other Names Candidate Signature Examiner s Initials Physics A Unit 1 For this paper you must have: l a pencil and a ruler l a calculator l a Data and Formulae Booklet (enclosed). General Certificate of Education Advanced Subsidiary Examination June 2012 Particles, Quantum Phenomena and Electricity Thursday 17 May am to am PHYA1 Question TOTAL Mark Time allowed l 1 hour 15 minutes Instructions l Use black ink or black ball-point pen. l Fill in the es at the top of this page. l Answer all questions. l You must answer the questions in the spaces provided. around each page or on blank pages. l Do all rough work in this book. Cross through any work you do not want to be marked. l Show all your working. Information l The marks for questions are shown in brackets. l The maximum mark for this paper is 70. l You are expected to use a calculator where appropriate. l A Data and Formulae Booklet is provided as a loose insert. l You will be marked on your ability to: use good English organise information clearly use specialist vocabulary where appropriate. (JUN12PHYA101) PHYA1

2 2 Answer all questions in the spaces provided. 1 (a) The K meson has strangeness 1. 1 (a) (i) State the quark composition of a meson. 1 (a) (ii) State the baryon number of the K meson. 1 (a) (iii) What is the quark composition of the K meson? 1 (b) Figure 1 shows a Feynman diagram for a possible decay of the strange quark. Figure 1 u v e e s W 1 (b) (i) Which interaction is responsible for this decay? 1 (b) (ii) Energy and momentum are conserved when the W particle is produced. State two other quantities that are also conserved and one that is not. conserved... conserved... not conserved... (3 marks) (02)

3 3 1 (b) (iii) Complete this equation for the decay of a K meson. K (a) The nucleus of a particular atom has a nucleon number of 14 and a proton number of 6. 2 (a) (i) State what is meant by nucleon number and proton number. nucleon number... proton number... 2 (a) (ii) Calculate the number of neutrons in the nucleus of this atom. 2 (a) (iii) Calculate the specific charge of the nucleus. answer =... Question 2 continues on the next page answer =... C kg 1 (3 marks) Turn over (03)

4 4 2 (b) The specific charge of the nucleus of another isotope of the element is Ckg 1. 2 (b) (i) State what is meant by an isotope. 2 (b) (ii) Calculate the number of neutrons in this isotope. answer =... (3 marks) 3 (a) Protons can interact with electrons by gravity and by two other fundamental interactions. In the following table identify these interactions and name the exchange particle involved. 10 interaction exchange particle 3 (b) State the quark composition of a proton. (04)

5 5 3 (c) A change in quark identity is involved in electron capture. 3 (c) (i) Explain what is meant by electron capture. (3 marks) 3 (c) (ii) In the space below draw a Feynman diagram representing electron capture. (3 marks) 9 Turn over (05)

6 6 4 (a) When monochromatic light is shone on a clean cadmium surface, electrons with a range of kinetic energies up to a maximum of J are released. The work function of cadmium is 4.07 e V. 4 (a) (i) State what is meant by work function. 4 (a) (ii) Explain why the emitted electrons have a range of kinetic energies up to a maximum value. (4 marks) 4 (a) (iii) Calculate the frequency of the light. Give your answer to an appropriate number of significant figures. answer =... Hz (4 marks) (06)

7 7 4 (b) In order to explain the photoelectric effect the wave model of electromagnetic radiation was replaced by the photon model. Explain what must happen in order for an existing scientific theory to be modified or replaced with a new theory. 12 Turn over for the next question Turn over (07)

8 8 5 (a) An alternating current supply provides an output voltage of 12 V rms at a frequency of 50 Hz. Describe how you would use an oscilloscope to check the accuracy of the rms output voltage and the frequency of the supply. The quality of your written communication will be assessed in your answer. (6 marks) (08)

9 9 5 (b) The power supply in part (a) is connected to a 12 V 24 W lamp. 5 (b) (i) Calculate the rms current in the lamp. 5 (b) (ii) Calculate the peak current in the lamp. answer =... A 5 (b) (iii) Calculate the peak power of the lamp. answer =... A answer =... W 10 Turn over for the next question Turn over (09)

10 10 6 A battery of negligible internal resistance is connected to lamp P in parallel with lamp Q as shown in Figure 2. The emf of the battery is 12 V. Figure 2 12 V lamp P 6 (a) Lamp P is rated at 12 V 36 W and lamp Q is rated at 12 V 6 W. 6 (a) (i) Calculate the current in the battery. lamp Q 6 (a) (ii) Calculate the resistance of P. answer =... A answer =... Ω (10)

11 11 6 (a) (iii) Calculate the resistance of Q. answer =... Ω 6 (b) State and explain the effect on the brightness of the lamps in the circuit shown in Figure 2 if the battery has a significant internal resistance. (3 marks) Question 6 continues on the next page Turn over (11)

12 12 6 (c) The lamps are now reconnected to the 12 V battery in series as shown in Figure 3. Figure 3 12 V lamp P lamp Q 6 (c) (i) Explain why the lamps will not be at their normal brightness in this circuit. 6 (c) (ii) State and explain which of the lamps will be brighter assuming that the resistance of the lamps does not change significantly with temperature. (3 marks) 12 Turn to page 14 for the next question (12)

14 14 7 Figure 4 shows two resistors, R 1 and R 2, connected in series with a battery of emf 12 V and negligible internal resistance. Figure 4 12 V R 1 R 2 V 7 (a) The reading on the voltmeter is 8.0 V and the resistance of R 2 is 60 Ω. 7 (a) (i) Calculate the current in the circuit. answer =... A (14)

15 15 7 (a) (ii) Calculate the resistance of R 1. answer =... Ω 7 (a) (iii) Calculate the charge passing through the battery in 2.0 minutes. Give an appropriate unit for your answer. answer =... unit =... 7 (b) In the circuit shown in Figure 4 R 2 is replaced with a thermistor. State and explain what will happen to the reading on the voltmeter as the temperature of the thermistor increases. (3 marks) 8 END OF QUESTIONS (15)

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