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including "David Copperfield
the important thing was for his work to be recognized on its own merit
that have been used since antiquity
who also directed the film
Sound, Energy and Wave Motion earth rotation including "David CopperfieldIn Sound, Energy and Wave Motion, musical instruments illustrate the relationship between the pitch, frequency, loudness and amplitude of sound waves. This film explains how and why sounds of the same pitch and loudness can differ in quality to give instruments their characteristic sound. 14 minutes Color
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