When two sound beams with different frequencies travel through soft tissue, which will travel faster?

• A. The higher-frequency sound
• B. The lower-frequency sound
• C. Both will travel at the same speed
• D. Cannot be determined

Answer: (C)

In soft tissue, the speed of sound is generally determined by the medium's properties, primarily its density and elasticity, rather than the frequency of the sound waves. For most conditions in soft tissue, the speed of sound is approximately constant, typically around 1540 meters per second. This is because sound waves are mechanical waves that propagate through mediums by inducing particle vibrations.

The speed of sound does not vary significantly with frequency in soft tissue under normal circumstances. Although frequency influences other properties of sound, such as wavelength and perception of sound (e.g., pitch), it does not alter the speed at which the sound waves travel through the medium itself. Therefore, both higher-frequency and lower-frequency sound beams will travel at the same speed when propagating through soft tissue.