How bumps reflect sound depends on bump height relative to wavelength.
Evidence
Consider a hard surface consisting of bumps of height d. Also consider an acoustic wavefront approaching it from a normal direction. The way this wavefront is reflected will depend on the height of the bumps relative to its wavelength. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2073
Categorization
Category: Definitional Content
Related
- Acoustic diffusion needs surface bumps sized between an eighth and a half wavelength (similarity 0.90)
- Reflection from a bumpy surface depends on bump height relative to wavelength. (similarity 0.90)
- Regularly spaced surface bumps diffuse sound only at specific frequencies (similarity 0.87)
- Whether a surface reflects or scatters waves depends on roughness relative to wavelength (similarity 0.87)
- Effective sound diffusion requires bumps sized between an eighth and half a wavelength. (similarity 0.86)
- Flat surfaces reflect low-frequency sound specularly but scatter high-frequency sound (similarity 0.85)
- Reflection and diffraction of sound both depend on object size relative to wavelength (similarity 0.84)
- Any change in surface reflectivity, not just bumps, causes sound diffusion (similarity 0.83)
- Sound bends around obstacles through a process called diffraction (similarity 0.82)
- Lower frequencies diffract more around obstacles than higher frequencies do (similarity 0.81)
- Element-based acoustic models scale poorly as wavelength shortens (similarity 0.81)
- Acoustic refraction parallels optical refraction via material-dependent wave speed (similarity 0.81)
- Hard boundaries reflect sound because pressure energy cannot cross a zero-velocity point. (similarity 0.80)
- Effective sound diffusion demands surface depths proportional to the target wavelength (similarity 0.79)
- Sound scatters or diffracts around loudspeakers based on wavelength relative to size (similarity 0.79)
Broader Connections
- Acoustic wavelength size relative to objects governs how sound interacts with them
#expands(0.92) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 149 - Flat surfaces reflect low-frequency sound specularly but scatter high-frequency sound
#expands(0.85) — Eric J. Heller, Why You Hear What You Hear- An…, 171 - Effective sound diffusion demands surface depths proportional to the target wavelength
#expands(0.80) — David Howard, Jamie Angus, coustics and Psychoacoustics, 2143 - Sound bends around obstacles through a process called diffraction
#expands(0.76) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 421