Which is TRUE about static electricity? It is a stationary electric charge that builds up on an insulating material and is discharged when another material touches it.

It can flow from an electric outlet along a wire to a lamp.

It travels in a circuit.

It usually has a switch that allows you to turn something on or off.

pl answer correct pls correct answers only pl not in a mean way

The frequency of a tuning fork can be found by the method shown. a long tube open at both ends is submerged in a beaker of water, and the vibrating tuning fork is placed near the top of the tube. the length l of the air column is adjusted by moving the tube vertically. the sound waves generated by the fork are reinforced when the length of the air column corresponds to one of the resonant frequencies of the tube. the smallest value for l for which a peak occurs in sound intensity is 7 cm. l what is the frequency of the tuning fork? the speed of sound in air is 345 m/s. answer in units of hz