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General Certificate of Education
Advanced Subsidiary Examination
January 2009
Physics A
PHYA1
Unit 1 Particles, Quantum Phenomena and Electricity
Mark
1
2
3
4
5
6
Tuesday 13 January 2009 1.30 pm to 2.45 pm
7
For this paper you must have: z a pencil and a ruler z a calculator z a Data and Formulae book.
TOTAL
Time allowed z 1 hour 15 minutes
Instructions
z Use black ink or black ball-point pen. z Fill in the boxes at the top of this page. z Answer all questions. z You must answer the questions in the spaces provided. Answers written in margins or on blank pages will not be marked. z Do all rough work in this book. Cross through any work you do not want to be marked.
Information
z The marks for questions are shown in brackets. z The maximum mark for this paper is 70. z You are expected to use a calculater where appropriate. z A Data and Formulae Book is provided as a loose insert. z You will be marked on your ability to:
– use good English
– organise information clearly
– use specialist vocabulary where appropriate.
(JAN09PHYA101)
M/Jan09/PHYA1
PHYA1
2
There are no questions printed on this page
DO NOT WRITE ON THIS PAGE
ANSWER IN THE SPACES PROVIDED
(02)
M/Jan09/PHYA1
Areas outside the box will not be scanned for marking
3
Answer all questions in the spaces provided.
1 Figure 1 shows part of an energy level diagram for a hydrogen atom.
Figure 1 n = 4 _________________ –0.85 eV n = 3 _________________ –1.50 eV n = 2 _________________ –3.40 eV n=1 1
_________________ –13.60 eV
(a) The level, n = 1, is the ground state of the atom.
State the ionisation energy of the atom in eV. answer = ................................... eV
(1 mark)
1
(b) When an electron of energy 12.1 eV collides with the atom, photons of three different energies are emitted.
1
(b)
(i) On Figure 1 show with arrows the transitions responsible for