Which frequency results in poorer detail but deeper penetration?

• A. Medium frequency
• B. Low frequency
• C. High frequency
• D. Frequency modulated

Answer: (B)

Low frequency is associated with poorer detail but allows for deeper penetration in various applications, such as medical ultrasound or geophysical imaging. This is primarily due to the characteristics of sound waves and the way they interact with different medium.

Lower frequency sound waves have longer wavelengths, which enable them to travel deeper into tissues or materials without being scattered or absorbed as much as higher frequency waves. This results in the ability to see structures that are located deeper within the body or material. However, the trade-off is that longer wavelengths do not resolve finer details as effectively, leading to images that may lack clarity or sharpness.

In contrast, high frequency sound waves have shorter wavelengths, providing better resolution and detail but limited penetration depth, making them more suitable for imaging superficial structures. The choice of frequency, therefore, balances the need for depth versus the need for detail, with low frequencies leaning toward deeper penetration at the cost of image resolution.