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Unformatted text preview: ... ..................................................................... ..................................................................... 881-181 Turn over – 12 – N01/430/S(3) C2. The diagram below shows an ideal gas in a heat engine undergoing a Carnot cycle. Pressure A B D C Volume (a) Which labelled parts of the cycle are (i) isothermal? [1] ..................................................................... ..................................................................... (ii) adiabatic? [1] ..................................................................... ..................................................................... (b) [1] In which processes is work done by the gas? ......................................................................... (c) The isothermal processes take place at 200 !C and 400 !C . maximum efficiency of this engine? What is the theoretical [2] ......................................................................... ......................................................................... ......................................................................... (This question continues on the following page) 881-181 – 13 – N01/430/S(3) (Question C2 continued) (d) In one of the processes, 1000 J of energy is absorbed from a hot reservoir. (i) During which process does this absorption of energy take place? [1] ..................................................................... ..................................................................... ..................................................................... (ii) Calculate the work output in the cycle. [2] ..................................................................... ..................................................................... ..................................................................... (iii) Calculate the energy ejected into the cold reservoir during the cycle. [2] ..................................................................... 881-181 Turn over – 14 – N01/430/S(3) OPTION D — BIOMEDICAL PHYSICS D1. The diagram below shows how the typical threshold of hearing varies with frequency for a normal young person. Sound intensity / W m−2 1 7 2 10 −6 4 10 −5 6 10 −4 8 10 −3 2 10 −10 1 10 −12 0 1 10 100 1000 10000 100000 Frequency / Hz [Source: Martin Hollins, Medical Physics, Figure 3.4, page 44] (a) Outline how the data for this graph could be obtained. [3] ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... (b) To what approximate frequency of sound is the ear most sensitive? [1] ......................................................................... (c) Over what range of frequencies is a sound of intensity 10−10 W m −2 audible? [1] ......................................................................... ......................................................................... ......................................................................... ......................................................................... (This question continues on the...
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This note was uploaded on 09/30/2011 for the course CHEM 102 taught by Professor Tina during the Spring '11 term at Global.

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