a)

A sinusoidal voltage is displayed on an oscilloscope screen. The separation on the screen between two adjacent peaks is 2.5 divisions, and you notice that the sweep speed is set to 2 ms per division. What is the frequency of the sinusoidal voltage?
You notice that when a sinusoidal voltage is displayed on an oscilloscope, its vertical span is 8 divisions peak to peak. If the vertical sensitivity is set to 1 V per division, what is the peak voltage of the sinusoidal voltage source?