During operation, the siphon jet relies on which of the following principles?

The correct choice is based on the understanding of how a siphon jet operates. In a siphon system, the movement of liquid is primarily driven by a pressure difference created by the elevation change between the two ends of the siphon. When a siphon jet is activated, the liquid enters at a higher point, creating an area of lower pressure at the exit point, allowing the liquid to flow through due to atmospheric pressure pushing on the liquid column at the inlet.

This principle of pressure difference is crucial because it enables the siphon jet to function without any additional pumping mechanisms. The difference in pressure between the higher and lower elevations allows the liquid to move and carry along any material it encounters.

While Bernoulli's principle, which deals with the relationship between the speed of a fluid and its pressure, plays a role in fluid dynamics, it is the direct pressure difference that is fundamental in the action of a siphon jet. Capillary action and hydrostatic equilibrium describe other phenomena and are not the driving force behind the operation of a siphon jet.