markscheme paper 3 hl 2001

# markscheme paper 3 hl 2001 - INTERNATIONAL BACCALAURAT...

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MARKSCHEME November 2001 PHYSICS Higher Level Paper 3 19 pages N01/430/H(3)M BACCALAUREATE BACCALAUR&AT INTERNATIONAL BACHILLERATO INTERNACIONAL

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There are several occasions when a mark is awarded for the correct answer and another one is given for the correct reasoning e.g. H1(c). In general, the right answer for wrong reasons gains no credit, but the point is to allow [1 mark] for muddled or missing reasoning. OPTION D & BIOMEDICAL PHYSICS D1. (a) observer in sound proof room / any sensible precaution; [1] increase intensity at one frequency until audible to observer / OWTTE; [1] repeat for different frequencies and different observers; [1] [3 max] (b) 1500 Hz [1 max] accept 800 Æ 2300 Hz; (c) from graph from 200 Æ 4300 Hz; [1 max] accept 150 Æ 250 and 3000 5000 Hz Reject answers that have the correct numbers but give two ranges and leave out the correct range. (d) as you get older hearing decreases; [1] particularly at high frequencies; [1] [2 max] (e) from graph, hearing loss = &20 dB; [1] normal hearing at this frequency is seen or implied; [1] 12 2 10 W m calculation (or otherwise) give 20 dB loss = ; [1] 10 2 10 W m [3 max] (f) no; [1] any sensible statement / argument; [1] e.g. to correct hearing loss back to zero, higher frequencies must be preferentially amplified more / OWTTE [2 max] & 6 & N01/430/H(3)M
D2. (a) no resultant force (in any direction); [1] no resultant torque (about any axis); [1] [2 max] (b) force from base to spine anywhere to the right and up the page; [1] correctly going through the point where the other forces meet; [1] [2 max] A ccept forces meeting at one point it they do so within 5 mm. & ± 70 o 10 o F S base of spine 1 . 0 m 8 5 & & & & & & & & & & & & & & & & R (c) use of torque = force % perpendicular distance; [1] to give torque = S sin (70) % 0.8 (= 0.752 S ); [1] [2 max] (d) correct balance of torques; [1] F sin (10) % 0.5 = S sin (70) % 0.8 to give F / S = 0.8 sin (70) / 0.5 sin (10) = 8.66 l 9; [1] [2 max] & 7 & N01/430/H(3)M

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[1] D3. (a) biological half life is time taken for half the amount of chemical to be removed from the body due to natural process / OWTTE; physics half-life is time taken for half the nuclei to decay radioactively / OWTTE; [1] [2 max] (b) realisation that 40 days = 2 biological half-lives [1] & and that 40 days = 5 physical half-lives; [1] so amount remaining = = 0.8 %; [1] () 7 0.5 [3 max] [1] [1] [1] (c) absorbed dose is the amount of energy per kg&; &whereas dose equivalent takes into account the different effects that different radiations have on biological tissue; mention of :± dose equivalent = quality factor % absorbed dose; [3 max] (d) Each relevant precaution [1] each. e.g. introduce minimum required to achieve purpose / shield / monitor those working with radioisotopes / introduce non toxic chemicals etc. [2 max] ± 8 ± N01/430/H(3)M
OPTION E & HISTORICAL PHYSICS [1] [1] [1] E1. (a) Aristotle: natural place of smoke is up / heavens whereas natural place of stone is on ground / OWTTE; Galileo: stone falls with uniform acceleration due to gravitational force; smoke rises as it is displaced by more dense air / OWTTE; [3 max] (b) Aristotle: 100 kg object would fall much faster than 10 kg object; [1] Galileo: objects would fall (nearly) together; [1] [2 max] (c) Aristotle: forward force of motion and gravity; [1] Accept answers that also include friction.

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## markscheme paper 3 hl 2001 - INTERNATIONAL BACCALAURAT...

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