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This is another programme from the series 'Experiment', Granada's series of filmed experiments
for secondary school pupils. Parodied in the first series of the BBC comedy series 'Look Around You'.
These programmes show how different from today programmes for schools were in the 70s & 80s.
[Quote from tvcream]
Experiment was so down-to-Earth it didn't even bother with such frivolities as a theme tune or in-vision presenter.
Instead, for the most part, educational film producer Jack Smith's disembodied voice guided the class through
some on-screen experiments, conducted in a plain studio by a faceless white-coated experimenter,
the equipment forever shot in impersonal close-up, with periodic silent pauses as Smith instructed the class
to "write that down!" when a result or measurement was shown.
The Rutherford Scattering of Alpha Particles
The experimental observations which led to the development of the Rutherford model of the atom
are reproduced in this programme. Students record the number and energy of a-particles scattered
at different angles from bombarded thin foils of different pure materials.
The observation that many a-particles which bombard a thin foil sample normal to its surface
are deflected at angles greater than 25 from normal enables students to understand Rutherford's
conclusion that the atom is a small, dense nucleus of positive charge with a surrounding large, diffuse electron cloud.
Simple relationships describing electrostatic repulsion between the a-particles and the dense nucleus and the
conservation of energy of the a-particles provide the link between Rutherford's theory and experimental evidence
which students can verify from their data.
Intended for sixth form students.
Written & Presented by Jack Smith
Production Company: Granada Television
Video: DivX 5 720x536 25.00fps 1157Kbps
Audio: MPEG Audio Layer 3 44100Hz 128Kbps
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