(JUN11PHYA101) WMP/Jun11/PHYA1 PHYA1 Centre Number Surname Other Names Candidate Signature Candidate Number General Certificate of Education Advanced Subsidiary Examination June 2011 Time allowed l 1 hour 15 minutes Instructions l Use black ink or black ball-point pen. l Fill in the boxes at the top of this page. l Answer all questions. l You must answer the questions in the spaces provided. Do not write outside the box 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. 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. For this paper you must have: l a pencil and a ruler l a calculator l a Data and Formulae Booklet. Physics A PHYA1 Unit 1 Particles, Quantum Phenomena and Electricity Tuesday 24 May 2011 9.00 am to 10.15 am Mark Question For Examiner’s Use Examiner’s Initials TOTAL 1 2 3 4 5 6 7
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(JUN11PHYA101)WMP/Jun11/PHYA1 PHYA1
Centre Number
Surname
Other Names
Candidate Signature
Candidate Number
General Certificate of EducationAdvanced Subsidiary ExaminationJune 2011
Time allowedl 1 hour 15 minutes
Instructionsl Use black ink or black ball-point pen.l Fill in the boxes at the top of this page.l Answer all questions.l You must answer the questions in the spaces provided. Do not write
outside the box 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.
Informationl 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.
For this paper you must have:
l a pencil and a rulerl a calculatorl a Data and Formulae Booklet.
Physics A PHYA1
Unit 1 Particles, Quantum Phenomena and Electricity
3 (b) (iv) Complete the Feynman diagram shown in Figure 1 that represents this decay.
Figure 1
(3 marks)
Turn over for the next question
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p e–
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8
(08)
4 (a) Line spectra were observed before they could be explained by theory. We now knowthat photons of characteristic frequency are emitted when the vapour of an element isbombarded by energetic electrons. The spectrum of the light emitted contains lines,each of a definite wavelength.
Explain how
• the bombarding electrons cause the atoms of the vapour to emit photons
• the existence of a spectrum consisting of lines of a definite frequency supports theview that atoms have discrete energy levels.
The quality of your written communication will be assessed in this question.
5 An oscilloscope is used to investigate various voltage sources. In order to do this avoltage source is connected to the y-input and the time base is switched off. Figure 2shows the screen of the oscilloscope when the y-input is not connected to a voltagesource.
Figure 2
Question 5 continues on the next page
9
Turn over �
(09)
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Figure 3 shows the screen when a 1.5 V cell is connected to the y-input.
Figure 3
5 (a) On the grid below show the appearance of the screen if the y-input is connected to a 2.5 V dc supply.
(1 mark)
10
(10)
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5 (b) The y-input is now connected to a sinusoidal ac voltage supply and the screen is shownin Figure 4.
Figure 4
5 (b) (i) Explain why a vertical line is now seen on the screen.
6 A cell of emf, ε, and internal resistance, r, is connected to a variable resistor R. Thecurrent through the cell and the terminal pd of the cell are measured as R is decreased.The circuit is shown in Figure 5.
Figure 5
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rε
R
V A
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The graph below shows the results from the experiment.
6 (a) Explain why the terminal pd decreases as the current increases.
7 (a) (ii) The resistors W, X, Y, and Z all have the same resistance. Show that your answer topart (a) (i) is consistent with the resistance of each resistor being 3.0 Ω.