An object that is much smaller than the wavelength of the sound beam is described as a

An object that is much smaller than the wavelength of the sound beam is described as a

• A. Rayleigh scatterer
• B. Mie scatterer
• C. Specular reflector
• D. Absorption

Answer: (A)

In ultrasound, how an object scatters sound depends on its size relative to the wavelength. When the object is much smaller than the wavelength, it behaves as a Rayleigh scatterer, scattering the sound nearly uniformly in all directions with relatively weak intensity because the wave can’t resolve fine structure across the particle. If the object’s size is about the same as the wavelength, you get Mie scattering with more complex angular patterns. A specular reflector implies a surface much larger than the wavelength that reflects like a mirror, and absorption means energy is lost rather than scattered. So the description that fits an object much smaller than the wavelength is Rayleigh scatterer.

In ultrasound, how an object scatters sound depends on its size relative to the wavelength. When the object is much smaller than the wavelength, it behaves as a Rayleigh scatterer, scattering the sound nearly uniformly in all directions with relatively weak intensity because the wave can’t resolve fine structure across the particle. If the object’s size is about the same as the wavelength, you get Mie scattering with more complex angular patterns. A specular reflector implies a surface much larger than the wavelength that reflects like a mirror, and absorption means energy is lost rather than scattered. So the description that fits an object much smaller than the wavelength is Rayleigh scatterer.