Which law dictates the angle of transmission that will occur at an interface with refraction of the sound beam.

Which law dictates the angle of transmission that will occur at an interface with refraction of the sound beam.

• A. Snell's Law
• B. Hooke's Law
• C. Fick's Law
• D. Boyle's Law

Answer: (A)

The angle of transmission at a boundary where sound refracts is determined by Snell's law, which connects the incident and transmitted angles to the speeds of sound in the two media. In acoustics, this relationship is often written as sin(angle of incidence) divided by the speed in the first medium equals sin(angle of transmission) divided by the speed in the second medium. Put simply, the path of the beam bends according to how fast sound travels in each tissue. If the second medium is faster than the first, the transmitted angle increases—the beam bends away from the normal. If the second medium is slower, the transmitted angle decreases—the beam bends toward the normal. There can also be a critical angle beyond which refraction cannot occur and reflection dominates. The other laws mentioned describe different physical phenomena and do not govern how the sound beam changes direction at an interface.

The angle of transmission at a boundary where sound refracts is determined by Snell's law, which connects the incident and transmitted angles to the speeds of sound in the two media. In acoustics, this relationship is often written as sin(angle of incidence) divided by the speed in the first medium equals sin(angle of transmission) divided by the speed in the second medium. Put simply, the path of the beam bends according to how fast sound travels in each tissue.

If the second medium is faster than the first, the transmitted angle increases—the beam bends away from the normal. If the second medium is slower, the transmitted angle decreases—the beam bends toward the normal. There can also be a critical angle beyond which refraction cannot occur and reflection dominates.

The other laws mentioned describe different physical phenomena and do not govern how the sound beam changes direction at an interface.