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An investigation into the relationship between distance and sound

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Introduction

An investigation into the relationship between distance and sound The aim of the experiment is to find the relationship between the distance and the sound, produced between an elastic band and a wall. The will be done by pulling back an elastic band at a different distance each time and shooting it at the wall and then recording the sound it produced using a speed level meter. Pulling back an elastic band with an increasing distance each time and then shooting it at the wall will result in increasing speed in which the elastic band would go. This would mean that the kinetic energy would increase too because the theory of the kinetic energy states that the kinetic energy is proportional to the speed squared. But as the elastic band hits the wall all the kinetic energy gets lost either in the form of heat or sound. So, the more kinetic energy there is the more sound would occur. Thus, it can be predicted that as distance increases the kinetic energy increases. In this lab the manipulated variable would be the distance of the elastic band that is pulled. The speed and time would also be the manipulated variables. The responding variable would be the sound intensity produced by the elastic band.

Middle

Trial 1 Sound ( + 0.5dB) Trial 2 Sound ( + 0.5dB) Trial 3 Sound ( + 0.5dB) 1.0 80.0 81.0 80.0 2.0 82.0 83.0 83.0 3.0 84.0 81.0 85.0 4.0 85.0 85.0 86.0 5.0 88.0 87.0 88.0 6.0 90.0 93.0 91.0 7.0 92.0 94.0 95.0 8.0 97.0 97.0 99.0 9.0 102.0 100.0 100.0 10.0 103.0 100.0 105.0 Calculating Average sound Avg.= (80 + 81 + 80) / 3 = 80.3 dB Calculating errors for the average sound: Eavg = (.05+0.05+0.05) /3 = 0.5 Presented data: Average sound recorded for each distance pulled back Length of rubber band pulled back from 15 cm( + 0.1cm) Average Sound due to the changing distance/ units + 0.5 units 1.0 80.3 2.0 82.7 3.0 83.3 4.0 85.3 5.0 87.7 6.0 91.3 7.0 93.7 8.0 97.7 9.0 100.7 10.0 102.7 Graph #1: Distance vs Sound Intensity: Graph #1 plot the distance vs. sound intensity. The points are connected with a straight line indicating that the distance does affect the sound. Note for this graph that the sound intensity is zero when the distance of elastic band pulled back is 0. This graph can be proportioned so that it passes through zero and thus there is no statistic error although there is no need to do this for what is being found out in this investigation.

Conclusion

This brought change in the direction of the elastic band hitting the wall which also resulted in the distance of the elastic band from the position of the sound level meter. Thus, the sound intensity recorded by sound level meter would not be accurate. Another problem was the external sound. The sound level was kept on high mode in the sound level meter which means that it was able to catch sound up to 150dB. The external sound for example, the noise of the people talking or the objects falling nearby can be captured by the sound level meter pretty well which can bring change in the data. Thus, the sound intensity recorded by the sound level meter in this case would not be right. Improvements: There were not any other errors caused by the apparatus. It was stable enough for the experiment. Therefore, there is no need to change the apparatus if this experiment would be done again. However, a protractor could be used to measure the angle so that there could be no problem with the angles in which the elastic band is shot at. Another improvement would be to do this experiment in a quiet place such as a quiet room, so that there would not be any other sound captured by the sound level meter than the elastic band's when hitting the wall. ?? ?? ?? ?? Ankit Shahi September 24 2009

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