1. Here is my two cents. Brainwave entrainment is using a natural frequency of the brain to coax the brain into that state.
"Alpha waves (8 to 12 Hz) are present when your brain is in an idling default-state typically created when you're daydreaming or consciously practicing mindfulness or meditation."
So you could apply a frequency of 8 to 12 Hz to guide the brain into a relaxed state.
Killing something involves applying a frequency that resonates with and destroys a pathogen.
"Dr. Rife and Dr. Clark found that frequencies that killed pathogens lay between 76,000Hz and 880,000Hz. So 76,000-880,000Hz is their mortal bandwidth".
For more details, please check the link: