Phonons
- Synopsis
- The origins of modern quantum mechanics date back to 1900 and Max Planck’s hypothesis that oscillators, which classically would be allowed to have any energy, are allowed to have only discrete energies. This led Einstein to his conjecture that light was emitted in chunks or quanta characterised by the relation E=Hv, where E represents the energy of the quanta or photons, H is Planck’s constant and v the frequency. Discusses phonons which are quanta of sound rather than light and shows an experiment at Exeter University which purports to have demonstrated the existence of phonons in liquid helium using a secondary effect. This secondary effect is the acoustic analogue of the photo-electric effect; an interesting experiment but does it verify what it is intended to prove?*
- Series
- Physics of Matter, The: Course S272
- Language
- English
- Country
- Great Britain
- Medium
- Video; Videocassette. Standard formats. col. 24 min.
- Year of production
- 1986
- Availability
- OUT OF DISTRIBUTION
- Subjects
- Physics
- Keywords
- matter; phonons; quantum mechanics
Credits
- Producer
- Ted Smith
- Cast
Graham Farmelo Stuart Freake
Production Company
Distributor
- Name
Open University Worldwide
- Web
- http://www.ouw.co.uk External site opens in new window
- Phone
- +44 (0) 1908 274066
- Address
- Walton Hall
Milton Keynes
MK7 6AA - Notes
- NB. As of May 2016 Open University Worldwide are no longer distributing DVDs. They have posted this message on their website: ‘Unfortunately Open University Worldwide Limited has decided that product sales are no longer viable given the reduced funding to Higher Education institutions and diminishing demand for the products we have traditionally stocked. At present the Open University Students Association (OUSA) will continue to sell the "Good Study Guide", and we are in discussion with other possible distributors to continue to make The Open University’s products available for purchase. As soon as we have any information on other channels of distribution we will update this notice’. Some products are still available via second hand dealers on Amazon.co.uk
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