Heinemann Physics Unit 3b Essay

Heinemann Physics Content and Contexts Units 3A and 3B

Worked solutions Unit 3B
Contents
The sounds of music The search for understanding Chapter 5 Wave properties and light
5.1 Wave properties 5.2 Wave behaviour 5.3 Wave interactions 5.4 Electromagnetic radiation 5.5 Electromagnetic radiation and matter 5.6 X-rays Chapter 5 Review

2 6 15
15 15 17 19 22 25 27

Chapter 6 Matter, relativity and astronomy
6.1 Extending our model of matter 6.2 Einstein’s special theory of relativity 6.3 To the stars 6.4 Fundamentals of astronomy 6.5 Hubble’s universe Chapter 6 Review

36
36 38 40 41 42 43

Chapter 7 Electric and magnetic fields
7.1 Force on charges in magnetic fields 7.2 Particle accelerators 7.3 Synchrotons 7.4 Mass spectrometry
What she should be trying to achieve is to decrease the number of beats per second until no beats are heard. At this point the frequency of the tuning fork and of the violin string are the same. E14 B

Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty Ltd)

Heinemann Physics Content and Contexts Units 3A and 3B ISBN 978 1 4425 1140 8 Page 4 of 69

Heinemann Physics Content and Contexts Units 3A and 3B
E15 C I would look for a low minimum power rating to avoid ‘clipping’ that could damage the tweeters. It is unlikely that I would turn up the speakers to maximum so I could get speakers that are less than the maximum power of the amplifier, so I would choose speakers C. E16

P  80.0 W R  8.00 

P  VI

and

V  IR

P  I 2R I P (80.0)  R (8.00)

I  3.16 A

Copyright © Pearson Australia 2010 (a division of Pearson Australia Group Pty
The particle theory of matter has an abundance of support, but remains theory. Light:  that light has a speed supports both the particle and wave theories, but not the filament theory  reflection can be explained by both wave and particle theories  mirrors and lenses can be explained by both wave and particle theories  Kepler’s inverse square law of light intensity and distance can be explained by both wave and particle theories  Foucault’s determination of the change in the speed of light in refraction supports the wave theory over the particle theory  diffraction effects support the wave theory over the particle theory  interference effects can be successfully explained by the wave theory only  Maxwell’s equations can explain the properties of light by assuming that it consists of electromagnetic waves  light has the same properties as the electromagnetic waves produced by Hertz  Michelson and Morley’s failure to detect the ether supports the particle theory, but Faraday suggests that