Tut1_bch1049_Answers - BCH1049 Concepts Answers to Tutorial...

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1 S 32 16 BCH1049 Answers to Tutorial One (Week 2) Concepts 1. A charged particle is caused to move between two electrically charged plates: (a) What is the sign of the electrical charge on the particle? Same charges repel and opposite charges attract, so the sign of the electrical charge on particle is negative. (b) Why does the path of the charged particle bend? The path of the charged particle bends because it is repelled by the negatively charged plate and attracted to the positively charged plate. (c) As the charge on the plates is increased, would you expect the bending to increase, decrease, or stay the same? The greater the magnitude of the charges, the greater the electrostatic repulsion or attraction. As the charge on the plates is increased, the bending will increase. (d) If the mass of the particle is increased while the speed of the particle remains the same, would you expect the bending to increase, decrease, or stay the same? As the mass of the particle increases and speed stays the same, the linear momentum (m × v) of the particle increases and bending decreases. (see “Mass Spectrometer”) 2. (a) Note the similarities and differences between a mass spectrometer and Thomson’s cathode-ray experiment.
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This note was uploaded on 01/11/2011 for the course BCH 1049 taught by Professor Michaelcwchan during the Spring '06 term at City University of Hong Kong.

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Tut1_bch1049_Answers - BCH1049 Concepts Answers to Tutorial...

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