🔍 Key Concepts

• sound attenuation and how mufflers reduce noise • relationship between gas velocity, pressure, and turbulence and the noise they create • how changes in flow direction and volume can affect sound energy

💭 Think About

• Think about what happens to sound when the flow of a gas is forced through baffles, chambers, or obstacles inside a muffler. • Which option would most likely help dissipate or cancel out sound waves rather than make them sharper or louder? • Consider which changes tend to create more turbulence and noise versus which changes help absorb or scatter sound energy.

✅ Before You Answer

• Identify which choice would help dissipate acoustic energy rather than increase it. • Eliminate any option that clearly increases turbulence or sharp pressure changes, since those usually increase noise. • Ask whether the change described would reasonably be achieved in the design of a typical engine exhaust muffler.