a. Asinewave has a period (duration of one cycle) of 620 ps. What is the corresponding frequency of this sinewave in kHz, expressed to three significant figures (see Study If the frequency of the sinewave is now reduced by a factor of 2.75, what will be the new period value? Express your answer in ms to three significant figures. Note: in the second part of this guestion, to avoid rounding errors in your calculations, use the full frequency value from the first part, not the value rounded to three significant figures. (10 marks)