Select which of the following statements are true about ions: two positively charged particles attract each other a positively charged particle and a negatively charged particle attract each other a positively charged particle and a negatively charged particle repel each other two negatively charged particles attract each other

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.