Final answer:
The question appears to be about subglottal pressure and phonatory airflow in the context of voice production, but the provided information pertains to sound waves, resonating air columns, and airflow in trachea, rather than the specific calculation of subglottal pressure by phonatory airflow.
Step-by-step explanation:
The question relates to the subglottal pressure divided by the mean phonatory airflow. However, it seems there may be some confusion with the information provided, as it does not directly relate to calculating this value. Instead, the information pertains to the physics of sound waves and the behavior of resonating air columns, as well as aspects of fluid flow like the Reynolds number. The calculation of the fundamental frequency of a tube closed at one end involves understanding the speed of sound in air and density considerations, whereas the replacement of air with helium addresses changes in sound speed due to different densities and sound speed in gases.
Without specific information on subglottal pressure and airflow, a final answer about the division of these two values cannot be provided. Nevertheless, the information presented is crucial in understanding the production and properties of sound in the context of human physiology and acoustics.