What happens when sound encounters a boundary between two tissues?

What happens when sound encounters a boundary between two tissues?

• A. It is completely absorbed
• B. It always passes through without change
• C. It bends, a phenomenon known as refraction
• D. It loses all momentum

Answer: (C)

When sound waves encounter a boundary between two different tissues, they undergo a phenomenon known as refraction, which is the bending of sound waves. This bending occurs due to a change in the speed of sound as it moves from one medium to another. Different tissues have varying densities and elastic properties, which affect how sound waves propagate through them. As sound travels from one tissue with a certain acoustic impedance to another with different impedance, its speed changes, causing the waves to change direction at the boundary. This bending effect is crucial in many applications, such as in medical ultrasound imaging, where it helps create images of internal structures by taking advantage of how sound reflects and refracts at tissue interfaces. The ability of sound to refract allows for the effective examination and analysis of tissues within the body.

When sound waves encounter a boundary between two different tissues, they undergo a phenomenon known as refraction, which is the bending of sound waves. This bending occurs due to a change in the speed of sound as it moves from one medium to another. Different tissues have varying densities and elastic properties, which affect how sound waves propagate through them.

As sound travels from one tissue with a certain acoustic impedance to another with different impedance, its speed changes, causing the waves to change direction at the boundary. This bending effect is crucial in many applications, such as in medical ultrasound imaging, where it helps create images of internal structures by taking advantage of how sound reflects and refracts at tissue interfaces. The ability of sound to refract allows for the effective examination and analysis of tissues within the body.