73REVIEW OF ACOUSTIC IMPEDANCE VARIATIONS WITH ULTRASONIC VELOCITY OF VARIOUS MATERIALSThe acoustic impedance is an important characteristic of materials for nearly all sonic and ultrasonic applications. As in the electrical analogy it will determine the efficiency of every transmission in the system from one element to another. The acoustic impedance of an instrument for any particular fingering is one of the major factors which determines the acoustic response of the instrument in that fingering. It determines which notes can be played with that fingering, how stable they are and it also helps determine whether they are in tune. The acoustic impedance also has a large influence on the sound producedjatinderpal897@gmail.comReview512015Acoustic impedance,FingeringJatinder Pal Singh,Rajesh SharmaDepartment of Physics, Post-Graduate Government College Sector-11, Chandigarh, India.,Department of Physics, Post-Graduate Government College Sector-11, Chandigarh, India.