What type of sound frequencies are reported to be most effective against bacteria?

The most effective sound frequencies against bacteria are typically high frequencies, and this is the basis for selecting low intensity, high frequency as the correct answer. Research has shown that ultrasonic frequencies can disrupt bacterial cells and inhibit their growth. These high-frequency sound waves can cause mechanical stress on bacterial membranes and lead to cell lysis or death, effectively reducing bacterial populations.

In contrast, lower frequencies often do not have the same disruptive capabilities, as they do not have the same level of energy to affect the physical structure of bacterial cells. Similarly, intensity plays a role; while higher intensity can potentially damage cells, low intensity at high frequencies allows for targeted action without causing excessive damage to surrounding tissues or materials.

This highlights why the choice of low intensity, high frequency is particularly effective in this context—allowing for precise targeting against bacteria while minimizing potential harm to other biological or material structures nearby.