How was the wavelength of the sound wave measured? Describe how the diameter of the column of air was measured. How was it known that the air column was vibrating at its first harmonic? Using all of the data, calculate the speed of sound in air. Why should you repeat the experiment? Why was it necessary to measure the diameter of the air column? Another student carried out the experiment. She measured the length of the column of air for each of the first two positions of resonance but she did not measure the diameter of the air column. Explain how this second student would find the speed of sound in air. INVESTIGATION OF THE VARIATION OF FUNDAMENTAL FREQUENCY OF A STRETCHED STRING WITH LENGTH HL: 2012 OL: 2014, 2009, 2006, 2002 In an experiment to investigate the variation of the fundamental frequency of a stretched string with its length the f l, following data were recorded. f/Hz 95 102 114 126 141 165 194 232 l/m 0.603 0.553 0.503 0.453 0.403 0.353 0.303 0.253 Draw a labelled diagram of the apparatus used in the experiment. Indicate on your diagram the length of the string that was measured. how the student set the string vibrating. How was the length adjusted? Why was the tension in the string kept constant during the experiment? How did the student know that the string was vibrating at its fundamental frequency? How was the frequency determined? the data, draw a suitable graph on graph paper to show the relationship between the fundamental frequency of the stretched string and its length. What conclusion can be drawn from your graph? The fundamental frequency of a stretched string depends on factors other than its length Name on these factors and give its relationship with the fundamental frequency. If you were doing an experiment to establish the relationship between the fundamental frequency of a stretched string and this other factor, how would you obtain the relevant data?
How was the wavelength of the sound wave measured? Describe how the diameter of the column of air was measured. How was it known that the air column was vibrating at its first harmonic? Using all of the data, calculate the speed of sound in air. Why should you repeat the experiment? Why was it necessary to measure the diameter of the air column? Another student carried out the experiment. She measured the length of the column of air for each of the first two positions of resonance but she did not measure the diameter of the air column. Explain how this second student would find the speed of sound in air. INVESTIGATION OF THE VARIATION OF FUNDAMENTAL FREQUENCY OF A STRETCHED STRING WITH LENGTH HL: 2012 OL: 2014, 2009, 2006, 2002 In an experiment to investigate the variation of the fundamental frequency f of a stretched string with its length l, the following data were recorded. f/Hz 95 102 114 126 141 165 194 232 l/m 0.603 0.553 0.503 0.453 0.403 0.353 0.303 0.253 Draw a labelled diagram of the apparatus used in the experiment. Indicate on your diagram the length of the string that was measured. how the student set the string vibrating. How was the length adjusted? Why was the tension in the string kept constant during the experiment? How did the student know that the string was vibrating at its fundamental frequency? How was the frequency determined? the data, draw a suitable graph on graph paper to show the relationship between the fundamental frequency of the stretched string and its length. What conclusion can be drawn from your graph? The fundamental frequency of a stretched string depends on factors other than its length Name on these factors and give its relationship with the fundamental frequency. If you were doing an experiment to establish the relationship between the fundamental frequency of a stretched string and this other factor, how would you obtain the relevant data?