The Resonator. When a wave hits the hole, part of it continues into the chamber and part of it is reflected. The wave travels through the chamber, hits the back wall of the muffler and bounces back out of the hole.he resonator is designed to work best in the frequency range where the engine makes the most noise; but even if the frequency is not exactly what the resonator was tuned for, it will still produce some destructive interference.
Although lahars contain at least 40% (by weight) volcanic ash and rock fragmentsâmaking them dense and viscous like wet concreteâthey actually flow faster than clear-water streams. These mudflows can rush down the flanks of a volcano at speeds as great as 40 miles (65 kilometers) per hour and can travel more than 50 miles (80 kilometers). Lahars that contain the most debris (as much as 90%) move the fastest and are the most destructive.
Turbulent lahars occur when there is 20 to 60% sediment in the lahar. Laminar flow lahars have more than 80% of sediment, and they flow very smoothly, but also move much faster. They can even float cars, houses and bridges! A volcano does not always have to erupt for a lahar to form.Sometimes heavy rains falling on old, loose volcanic ash or a crater dam failure can also cause a lahar. Even with a small volcanic eruption, a large lahar can travel quickly down a mountain, up to 100 km (62 miles)/hour.s the lahar travels down the mountain, other debris such as rocks, logs, and trees become part of the fast moving mudslide. Secondary lahars, forming after the volcanic eruption, also include volcanic ash. There are two types of lahar flows: turbulent and laminar flow.