Physics and Properties of Materials

# Physics and Properties of Materials - Cork Institute of...

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Cork Institute of Technology Bachelor of Engineering (Honours) in Chemical and Process Engineering - Stage 1 (NFQ Level 8) Autumn 2006 CE 1.4 Physics and Properties of Materials (Time: 3 Hours) Answer FIVE questions. At least THREE must be from Section A and ONE from Section B. Stefan constant = 5.67 × 10 −8 W/m 2 K 4 ; Wien law constant = 2.898 × 10 −3 m . K; Absolute zero = -273 0 C; k = 1.38 × 10 −23 J/K N A = 6 × 10 23 mol -1 ; 1 a.m.u. = 1.66 × 10 −27 kg Examiners: Prof. L. Kershenbaum Mr D. O’Connor Dr A. O’Connor Section A 1 Answer any four of the following six parts. Each part carries 5 marks. (a) Distinguish between the emf of a battery and the voltage that it actually delivers. Explain the significance of impedance matching. (b) The power per unit area striking the top of the earth’s atmosphere (the “solar constant”) is 1.4 kW/m 2 . If the earth reflects 39% of this back into space, calculate the blackbody temperature of the earth. Why is this an underestimate?

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