Physics · 2014 · May · Paper 2 · HL · TZ1 · Question paper

40 pages M14/4/PHYSI/HP2/ENG/TZ1/XX Wednesday 7 May 2014 (morning) Physics hiGhER lE vEl PaPER 2 INSTRUCTIONS TO CANDIDATES • Write your session number in the boxes above. • Do not open this examination paper until instructed to do so. • Section A: answer all questions. • Section B: answer two questions. • Write your answers in the boxes provided. • A calculator is required for this paper. • A clean copy of the Physics Data Booklet is required for this paper. • The maximum mark for this examination paper is [95 marks]. 2 hours 15 minutes © International Baccalaureate Organization 2014 Examination code 2 2 1 4 – 6 5 0 8 [Personal identifier removed] [Personal identifier removed] – 2 – M14/4/PHYSI/HP2/ENG/TZ1/XX 40EP02 Section a Answer all questions. Write your answers in the boxes provided. 1. Data analysis question. Connie and Sophie investigate the effect of colour on heat absorption. They make grey paint by mixing black and white paint in different ratios. Five identical tin cans are painted in five different shades of grey. 10 % black paint 30 % black paint 50 % black paint 70 % black paint 90 % black paint Connie and Sophie put an equal amount of water at the same initial temperature into each can. They leave the cans under a heat lamp at equal distances from the lamp. They measure the temperature increase of the water, T, in each can after one hour. (a) Connie suggests that T is proportional to B, where B is the percentage of black in the paint. To test this hypothesis, she plots a graph of T against B, as shown on the axes below. The uncertainty in T is shown and the uncertainty in B is negligible. /CT ° 40 35 30 25 20 15 10 5 0 0 20 40 60 80 100 B (This question continues on the following page)