A wave is traveling with a speed of 5m/s for 7 seconds. How far has the wave travelled?

As the wave moves to and fro so the total distance will be d=2x5=10 m

we have

time (t) = 5 s

hence velocity will be =2 m/s

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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.