# Velocity of Sound

2243 WordsJul 2, 20129 Pages
Experiment 7: Velocity of Sound Jaybee J. Balilea, Sharmaine O. Baysic, Maria Anjelette Patricia C. Belen, Dianne Grace D. Bolloso Department of Biological Sciences College of Science, University of Santo Tomas Espana, Manila Abstract Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard. It is produced when something vibrates causing its the medium (water, air, etc.) around it to vibrate as well. In common everyday speech, speed of sound refers to the speed of sound waves in air. Sound travels faster in liquids and non-porous solids than it does in air. In this experiment, velocity of…show more content…
In this activity, a Vernier microphone and a computer were used to know the speed of sound based on the graph and the values produced on the computer screen. The microphone was placed near the open end of a closed tube and a member of a group snapped his fingers near the tube to determine the speed of sound. The time interval was determined with the start of the first vibration and the start of the echo vibration. The noted time interval was the time for sound to travel through the tube and back. The speed of sound was computed by dividing the length of the tube by ½ of the time interval. The computed experimental speed was 355.47 m/s. The calculated percent error was 2.60% and it was not that large compared to the percent errors in the first activity. The causes of errors in this activity could be some mistakes in the computations particularly in estimating values, and probably the graph produced was not that perfect. Table 3. Speed of Sound in Solid Average of distances between node to node 6.11 cm/ 0.061 m Wavelength of sound in air 12.22 cm/ 0.122m Frequency of sound 2845.90 Hz Length of rod 93 cm / 0.93 m Wavelength of sound in rod 1.86m Experimental speed of sound in the rod 5293.37 m/s Theoretical speed of sound in the rod 5055.25 m/s % error 4.71% In this activity, a Kundt’s tube and a layer of cork dust were used to determine the speed of sound in the rod. A meter