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At 04:09 PM 12/7/01, you wrote:
Why does the speed of sound in still air increase slightly with frequency?
Thanks,
Larry
For the usual reasons: labeled as 'dispersion'.
This dispersion is not noted for the usual audible range say 20 to 20 kHz
but ultra sonic waves can (apparently) approach a natural frequency
of absorption.
Sound confined in say a tube shows dispersion depending on a ratio
of wavelength to diameter.
Sound intensity too can provide non linear effects - shocks travel faster.
Brian Whatcott
Altus OK Eureka!