When you tap on the bar it creates an acoustic wave that will propagate at the speed of sound in the material. For subatomic particles, the most intuitive way

When you tap on the bar it creates an acoustic wave that will propagate at the speed of sound in the material. For subatomic particles, the most intuitive way to think about things is to adopt the "fields are real" mindset. Here fields are the underlying reality, and particles are just a pattern of waves excited in the fields. Disturbances in all fundamental fields we've discovered propagate at the speed of light, and we have pretty solid reasons for believing no future discovery will contradict that, as it would break causality in a fundamental way.