Which frequency provides deeper tissue penetration?

Which frequency provides deeper tissue penetration?

• A. 1 MHz
• B. 3 MHz
• C. 0.5 MHz
• D. 5 MHz

Answer: (A)

Lower frequencies penetrate deeper into tissue because they experience less attenuation as they travel through layers. Higher frequencies are absorbed more quickly by superficial tissues, so they heat and affect only the near-surface areas. So, among the options, the deepest penetration comes from the lowest frequency listed, while the higher frequencies will reach less depth. Keep in mind the trade-off: lower frequency means broader heating with less precision, whereas higher frequency provides more superficial, focused heating.

Lower frequencies penetrate deeper into tissue because they experience less attenuation as they travel through layers. Higher frequencies are absorbed more quickly by superficial tissues, so they heat and affect only the near-surface areas. So, among the options, the deepest penetration comes from the lowest frequency listed, while the higher frequencies will reach less depth. Keep in mind the trade-off: lower frequency means broader heating with less precision, whereas higher frequency provides more superficial, focused heating.