Which pulse parameter is determined by both the sound source and the medium?

Spatial pulse length is a parameter that is influenced by both the sound source and the medium. It is defined as the length of a pulse in space, which is determined by the wavelength of the sound in the medium and the number of cycles in the pulse.

The wavelength of sound is dependent on the speed of sound in the medium (which varies depending on the medium's properties, such as density and elasticity) and the frequency of the sound produced by the transducer (the source). Therefore, as the sound travels through different media, the spatial pulse length changes based on both the characteristics of the transducer and the properties of the medium it travels through.

This interaction highlights the unique nature of spatial pulse length in that it is not solely reliant on the source alone or the medium alone; rather, it is a combined effect of both. Other parameters, such as pulse duration, PRF, and duty factor, are influenced primarily by the sound source and do not incorporate the medium's properties in the same manner. Thus, spatial pulse length accurately reflects the contribution of both elements in its determination.