Estimate the extent of spectral broadening in the frequency return of a cw Doppler flowmeter due to the following two factors (give the width of broadening for each factor as a percentage of the center frequency and assume that the transmit and receive functions are performed by the same transducer element): (a) The incident and receive beams are not composed of parallel rays but rather are focused to a spot 4.0 cm away from the transducer. The transducer diameter is 1.0 cm, and its axis forms an angle of 60 with respect to the axis of the blood vessel. (b) The effective viewing volume has a dimension of 2.5 mm along the direction of blood flow, so each red blood cell is viewed only for a finite amount of time. The incident frequency is 3MHz