2. The open D-string on a violin is tuned to a frequency of 294 Hz. a) What would be the desirable frequency of the MAR (hint: see appendix C)? b) Let's use this frequency to estimate the volume of the enclosed air in a good violin. To carry out this estimation, assume that the thickness of the top plate at the f-holes is 0.25 cm and that the area of each f-hole is 6.5 cm2. What is the calculated volume? Does your answer seem reasonable