Sound wave molecules have zero velocity at compression peaks due to inertia

Evidence

Looking at Figure 9.18(c) and (d) it is evident that pressure and particle velocity are inverses of each other. It is intuitively easy to understand that air molecules that are against a hard wall have nowhere to go, and particle velocity is zero. Equally instinctive is the notion that a sound pressure wave arriving at a rigid wall will build up pressure as it is unsuccessful at moving the wall and is reflected. So, at a reflecting boundary, pressure is at a maximum, and particle velocity is at a minimum. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1024 (#corroborates, via linked claim)

Categorization

• XREF: connects to: Sound reflecting off a hard boundary has zero particle velocity — Toole, Floyd E, Sound reproduction- the acoustics and…, 1024; Sound waves are longitudinal waves of alternating compression and rarefaction; Sound is alternating pressure condensations and rarefactions (+4 more)

Related

• Sound reflecting off a hard boundary has zero particle velocity (similarity 0.93)
• Hard boundaries reflect sound because pressure energy cannot cross a zero-velocity point. (similarity 0.88)
• Pressure is scalar while velocity gives a sound wave its direction (similarity 0.83)
• A sound wave’s pressure component arises from the force driving molecular displacement. (similarity 0.83)
• Sound pressure and particle velocity components are always in phase (similarity 0.82)
• A medium’s density and elasticity relate sound pressure to particle velocity. (similarity 0.81)
• Molecular inertia makes air particle velocity change smoothly and continuously (similarity 0.81)
• At an open boundary, pressure equals zero while velocity doubles. (similarity 0.81)
• Sound pressure is in phase with molecular velocity, not with displacement (similarity 0.81)
• All acoustic impedances are ratios of force to velocity (similarity 0.80)
• Sound pressure is the small pressure deviation caused by a sound wave (similarity 0.80)
• Excitation in an elastic medium generates waves from the source (similarity 0.80)
• Sound information propagates slower than average molecular speed (similarity 0.79)
• Air is a seething low-density molecular gas with constant collisions (similarity 0.79)
• Speed of sound depends on temperature, not pressure (similarity 0.78)

Broader Connections

• Sound reflecting off a hard boundary has zero particle velocity #corroborates (0.95) — Toole, Floyd E, Sound reproduction- the acoustics and…, 1024
• Sound waves are longitudinal waves of alternating compression and rarefaction #expands (0.75)
• Sound waves have an inherent velocity component tied to molecular displacement. #expands (0.75)
• Sound is alternating pressure condensations and rarefactions #expands (0.72)
• A sound wave’s pressure component arises from the force driving molecular displacement. #expands (0.72)
• Hard boundaries reflect sound because pressure energy cannot cross a zero-velocity point. #corroborates (0.72)