Physics > AQA > Specimen MS - Paper 1 AQA Physics AS-Level (All)

Specimen MS - Paper 1 AQA Physics AS-Level

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Question Answers Additional Comments/Guidance Mark 01.1 0 ... ud 1 1 uud 1 mark each 5 01.2 Strong nuclear circled 1 01.3 Charge 1 +1 = 1 + X X = 1 Any order 1 Baryon number 0 + 1 = 0 + X X = 1 1 Strangeness 0 + 0 = 1 + X X = -1 1 01.4 Weak nuclear circled 1 01.5 Strangeness of X is -1, First mark is for showing that strangeness changes The strangeness of the pion and neutron are both zero Second is for stating that this can only happen if the 1 The strangeness changes from -1 to 0 interaction is weak. This can only occur in weak interactions.  1 01.6 … . n → p + β - + νe  First mark is for the proton 1 Second is for the beta minus and antineutrino. 1 PMT 7 01.7 The only particles remaining are electrons/positrons and 1 1 neutrinos/antineutrinos which are stable  And a proton which is the only stable baryon  1 1 02.1 The process involves the ejection of electrons which are negatively charged.  1 Any electrons ejected will only make the positive charge greater.  1 PMT 8 02.2 The mark scheme gives some guidance as to what statements are expected to be seen in a 1 or 2 mark (L1), 3 or 4 mark (L2) and 5 or 6 mark (L3) answer. Guidance provided in section 3.10 of the ‘Mark Scheme Instructions’ document should be used to assist in marking this question. The following statements are likely to be present To demonstrate threshold frequency: The metal should be kept the same, and the light source varied. Using any metal, and light sources 1 and 3, no charge will be lost with light source 1 but charge will be lost with light source 3 because light source three has a greater photon energy and therefore frequency (from E=hf) and is above the threshold frequency as the photon energy is greater than the work function of the metal but light source 1 has a photon energy less than the work function of the metal so its frequency is below the threshold frequency. To demonstrate work function The light source should be kept the same, and the metal varied Use light source 2 as the other two will either cause all three metals to lose their charge, or none of the metals to lose their charge. Use each metal in turn, so that zinc loses its charge, due to its low work function, but copper and iron do not lose their charge. 6 Mark Criteria QoWC 6 Both ideas fully analysed, with full discussion of alternatives. The student presents relevant information coherently, employing structure, style and sp&g to render meaning clear. The text is legible. 5 Both ideas analysed with supporting discussion but without alternatives 4 Both ideas analysed, with one dealt with satisfactorily and the other with some supporting discussion The student presents relevant information and in a way which assists the communication of meaning. The text is legible. Sp&g are sufficiently accurate not to obscure meaning. 3 Both ideas analysed, with only one dealt with satisfactorily 2 One idea analysed with some supporting discussion The student presents some relevant information in a simple form. The text is usually legible. Sp&g allow meaning to be derived

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