Hurry !
how many wavelengths pass a given point of time is the definition of frequency. true or false

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

pretty sure it's false

i think it would be 5