• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Rutherford's Alpha Particle Scattering Experiment:The discovery of the Nucleus...

Extracts from this document...

Introduction

Rutherford’s Alpha Particle Scattering Experiment:

The discovery of the Nucleus…

Rutherford was the world leader in alpha-particle physics. In 1906, at McGill, he had been the first to detect slight deflections of alphas on passage through matter. In 1907, he became a professor at the University of Manchester, where he worked with Hans Geiger. This was just a year after Rutherford's old boss, J. J. Thomson, had written a paper on his plum pudding atomic model suggesting that the number of electrons in an atom was about the same as the atomic number. (Not long before, people had speculated that atoms might contain thousands of electrons. They were assuming that the electrons contributed a good fraction of the atom's mass.)

Rutherford's alpha scattering

...read more.

Middle

        Most of the particles went straight through the foil without any deflection – however some of the particles (about 1 in 8000) were deflected by a degree of more than 90 degrees.

This meant that the idea of the “Plum pudding” model (suggested by J.J. Thompson in 1906) was in dispute – a model which Rutherford himself had been a believer in.

Rutherford pondered this problem for some months. He eventually decided there was simply no way it could generate the strength of electric field necessary to deflect the fast moving alphas.

The electric field from a sphere of charge reaches its maximum on the surface. Therefore, for a given charge, assumed spherically distributed, the only way to get a stronger field is to compress it into a smaller sphere.

...read more.

Conclusion

If an alpha goes through 400 layers of atoms, and in each layer it has a chance of one in ten thousand of getting close enough to the nucleus for a one-degree scatter, this is unlikely to happen twice. It follows that almost certainly only one scattering takes place. It then follows that all ninety or more degrees of scattering must be a single event, so the nucleus must be even smaller than one hundredth the radius of the atom - it must be less than 10-13 meters, as stated above.

image00.png

...read more.

This student written piece of work is one of many that can be found in our GCSE Radioactivity section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a star student thought of this essay

4 star(s)

Response to the question

Response to the question is done well and outlines the experiment and explains how the different theorys came about from the way the experiment went. To improve the candidate should have included more information on the plum pudding model and ...

Read full review

Response to the question

Response to the question is done well and outlines the experiment and explains how the different theorys came about from the way the experiment went. To improve the candidate should have included more information on the plum pudding model and perhaps a diagram so they could explain better how the theory behind that was disproved.

Level of analysis

No clear introduction is used which would be good to introduce the topic and the concepts of the experiment. The candidate goes into the history behind the experiment well outlining other theories of the time, and how the setup of the experiment worked and the conclusions that could be drawn from it. The sections should be split up a little more clearly so we can follow the experiment a bit better, such as with spaced lining between paragraphs or sub-headings. The diagram included also helps define the experiment well.

Quality of writing

Good grammar, punctuation and spelling throughout. Sources are not stated which should be done so that the right essays can be given credit, as if not it is plagiarism. The candidate should have used even a base referencing manner.


Did you find this review helpful? Join our team of reviewers and help other students learn

Reviewed by skatealexia 31/07/2012

Read less
Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Radioactivity essays

  1. Marked by a teacher

    Factors Affecting Heat Loss.

    63 72 68 300 68 63 72 67 360 67 61 72 66 420 60 60 71 63 480 65 60 70 65 540 65 60 69 64 600 64 54 68 63 660 63 58 67 62 720 63 57 66 62 780 62 57 66 61 840 62

  2. Peer reviewed

    As part of my AS physics coursework I went on a trip to Queen ...

    4 star(s)

    Why and When Is UltraSound used In Pregnancy? Ultrasound is considered to be safe and an accurate investigation into the fetus. Diagnosis can be spotted early and confirmation of early pregnancy. Ultrasound can observe and measure the embryo and find the exact date of pregnancy. A visible heartbeat can be seen and detectable by pulsed Doppler ultrasound by about 6weeks.

  1. Investigate how the material of a cup affects the time it takes for the ...

    Temperature for different cup materials (oC) Aluminium Ceramic Paper Polystyrene Test1 Test2 Average Test1 Test2 Average Test1 Test2 Average Test1 Test2 Average 1 78 75 76.5 74 72 73 76 75 75.5 77 76 76.5 2 76 72 74 71 67 69 74 72 73 74 74 74 3 74 68 71 68 66 67 71

  2. Descriptive Writing - Three months. Three months of boredom. Three months of optimism. Three ...

    The sense of disbelief echoes your feelings as the kick off signals the start of the next episode of your day. The crowd, spurred on by the missed opportunity to go down 2-0 at half time have at least something to hold on to as the tempo starts to increase

  1. Is sunbathing good for you?

    What should people be aware of? We should all try not to get burnt in the sun and to be aware of the damage it can do to our skin. But some people need to be particularly careful. You should be particularly careful about going out in the sun if

  2. Heating and cooling revision notes for science

    Evaporation is the reason why damp clothes dry on a washing line. Condensation is the reason why windows become foggy on a cold day. Evaporation:- The particles in a liquid have different energies. Some will have enough energy to escape from the liquid and become a gas.

  1. Brief History of the atom model.

    The alchemists were the first scientists to perform systematic experimentation. They recorded every experiment they performed, and shared their knowledge with other alchemists. This expanded the knowledge base of chemistry hundred fold. Such recording had never taken place. The knowledge of chemicals and their reactions if the original data that guides us today.

  2. Smoke Alarms Assignment In this CDA I will be explaining how smoke alarms work, ...

    135/401 x 100= 33.6% % of gamma = 162/401 x 100= 40.4% Am 241 should be an alpha emitter We did this to find out if there was more than one type of radiation coming out of the smoke alarms.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work