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# 304 - ABSTRACT.The experiment is about determining the...

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ABSTRACT . T he experiment is about determining the velocity of a sound in a metal rod using Kundt's Tube. The velocity of sound varies with the medium where it travels. The velocity of the sound in a metal rod was obtained in the experiment by the application of the principles of the resonance. Because sound waves are not visible to naked eyes, we are using Lycopodium powder inside the tube as a reference on how sound waves travels. When the wave enters the tube,it will agitate the dust inside and forms visible shapes of a wave. Using principles of resonance we can determine the speed of sound in air and in solid materials. INTRODUCTION Kundt's tube is an experimental acoustical  apparatus   invented   in   1866   by   German   physicist  August Kundt for the measurement of the speed of  sound in a gas or a solid rod. It is used today only  for   demonstrating   standing   waves   and   acoustical  forces.   Kundt's tube can be use if you want to  determine the speed of sound in air and in solid  materials.  This   experiment   helps   us   to   understand  more about how wave travels and how can we use it  on   its   other   applications.   Because   sound   waves  travel almost the same as anthena signal waves  travels   so   using   this   principles   we   can   also  understand how radio signals also travels. THEORY Sound travels in solids, liquids and gases.  Their velocity  is   maximum  in  solids  and  least  in  gases. We hear various kinds of sound in our daily  life,pleasant     sounds     called     the     musical  sounds,unpleasant   sound   called   the   noise,   loud  sound,high pitched sound etc. In this laboratory, we  can be able to measure speed of sound using the  traditional method. The sound is allowed to travel at  solid and gas, particularly in a metal rod and an air  column. By that, frequency and the speed of the  sound can be obtained. This method is called the  Kundt’s tube method. A diagram of the Kundt’s tube  is drawn on the next column for visualization.   Fig 1. Complete diagram of Kundt's Tube Kundt’s tube is a long narrow tube made of  glass   that   is   close   by   a   stopper   at   one   end.   It  ismounted in a certain metal bar frame so that itcan  be  adjusted  vertically/longitudinally  withrespect to  the frame. A metal rod is clamped tothe support  frame, exactly at the center of therod. The rod is  clamped   at   the   center   to   producea   fundamental  mode of vibration. This rod has adisk at its one end.  That is inserted into the glasstube but it does not  touch the tube. In addition,the glass tube contains  some dust inside which is distributed evenly in the

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