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Edexcel | Physics WPH0 | S 17 4 1 | 1 hour 30 minutes
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17
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In the early 1900s Geiger and Marsden carried out experiments in which a beam of high speed alpha particles was directed at thin gold foil.

The apparatus used is represented in the diagram.

                       

 

17
(a)
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2 Mark s

Explain why the alpha source was placed in a lead box with a single small hole.

17
(b)
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6 Mark s

The following conclusions about atoms were made after the experiments.

1. The atom is mostly empty space.

2. The atom contains a small region of highly concentrated charge.

3. Most of the mass of the atom is concentrated in a very small space relative to thesize of the atom.

Explain how the observations from the experiments led to these conclusions.

17
(c)
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2 Mark s

The source of alpha particles in some experiments was radium.

Complete the nuclear equation to show alpha decay for radium.

   

17
(d)
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3 Mark s

Determine the potential difference that would be required to bring it to rest. You may ignore relativistic effects at this speed.

mass of alpha particle = 4.00 u

 

                                            Potential difference = ..........................................

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