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# Resonance in a Closed Air Column Investigation.

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Introduction

Fletchers Meadow Secondary School Resonance in a Closed Air Column Application of Resonance User 4/20/2010 Prediction I think the speed of sound, when using the higher frequency tuning fork; will increase if a low frequency tuning fork is used. When a higher frequency is used, the wavelength is shorter according to the speed equation, where f ? v so when f is high frequency the wavelength is shorter. When wavelength is shorter the speed is also lower compared to a high frequency object. The speed of sound is higher in higher temperature. Using the speed of sound equation the higher the temperature the faster the sound. Observations: Tuning Fork 1 Room Temperature Trial 1st Resonant Length of Tube 1 20 cm 2 20 cm 3 20 cm AVG 20 cm Tuning Fork 1 Room Temperature Trial 1st Resonant Length of Tube 1 26 cm 2 25 cm 3 26 cm AVG 26 cm Tuning Fork 2 Different Temperature Trial 1st Resonant Length of Tube 1 7 cm 2 9 cm 3 6 cm AVG 8 cm Tuning Fork 2 Room Temperature Trial 1st Resonant Length of Tube 1 17 cm 2 16 cm 3 6 cm AVG 15 cm Knowledge and Understanding 1. ...read more.

Middle

I think that all the average wavelengths should be altered to 0.2. This is because, when we were trying to read the numbers we would level the tube and the ruler with our hands and the whole number than the hand touched closest to was recorded. In that case, the 1st resonant length recorded can be either 0.2 higher or lower than the number recorded. With a change in resonant length there is bound to be a change in wavelength and speed as well. So, using the 0.2 of the resonant length, the wavelengths should be 0.8. This figure was determined by calculating the wavelengths using resonant lengths that were 2 or 2. This gave answers that were 0.8 above or below the calculated wavelengths above. This same method is used to find that the speed should 384 (if significant digits weren't used). 8. The one thing I would change about this lab is probably putting the ruler in the bucket and starting from the exact value that the tube started. So, before the lab started I would check the length at which the tube started from in or the length of the tube. Then as I hear the 1st resonance at a certain length, I can just subtract the starting length from the length I hear the sound to find the measure of the 1st resonant length. ...read more.

Conclusion

11. Unlike brass instruments, the source of vibrations of a wood instrument is not the lips but the vibration of the reed. As mentioned in the question, the tube or the body of the instrument is the column of open air. In a wind instrument, the reed placed at the end of the instrument causes resonance. The reed is placed under the mouthpiece of the instrument. In this way, when the musician blows into the mouthpiece, the air is blown is through the reed. As the air is blown through the reed, the reed starts to vibrate which creates a wide range of tremoring frequencies. Resonance occurs when the vibration of the reed is equivalent to the vibration of the air column inside the metal tube (the body of the instrument) just like the tuning fork and tube. When the frequencies match (supercrest/supertrough), the instrument produces a loud noise. The length of the tube is changed by opening and closing the holes on the instruments. When the tube is shortened, it results in a shorter wavelength and according to the wave equation a shorter wavelength means a higher frequency. This means that the more holes that are covered, the shorter the tube resulting in a higher pitch. So, when there are no holes covered the tube of the instrument is at its highest length which creates a low pitch sound. ?? ?? ?? ?? 6 ...read more.

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