1. To investigate the variation of frequency in a stretched string with length. Experiment 1 Tuning fork Paper rider Sonometer Apparatus

2. Method Leaving the tension unchanged, place a paper rider on the centre of the wire. Strike a tuning fork and touch the wire at a bridge. Move the other bridge until the paper rider falls off. Note the frequency on the fork and the length between the bridges.

3. The Results Plot a graph of frequency against 1/length. The graph is a straight line through the origin showing that frequency is inversely proportional to length. Frequency Hz Length m1/length 2560.57 2880.499 3200.449 341.30.424 3840.377 4800.305

4. Precautions 1.Place the paper rider in the centre of the wire. 2.Keep the tension fixed as there can only be 2 variables.

5. A wee sum on the experiment The tension on the string is 38N. 1. From the graph find the length that has a fundamental frequency of 300Hz. 2.Find the mass of this length of wire.

6. To investigate the variation of frequency in a stretched string with tension. Experiment 2

7. Apparatus Tuning fork Paper rider Sonometer Newton balance

8. Method Leaving the length unchanged, place a paper rider on the centre of the wire. Strike a tuning fork and touch the wire at a bridge. Use the key to adjust the tension until the paper rider falls off. Note the frequency on the fork and the tension on the newton balance.

9. The Results Plot a graph of frequency against The graph is a straight line through the origin showing that frequency is proportional to the root of the tension. Frequency Hz Tension N

10. Precautions 1.Place the paper rider in the centre of the wire. 2.Keep the length fixed as there can only be 2 variables.