Question 29
A wooden metre rule or half-metre rule is clamped at a desk edge, with a mass taped to its free end. Keep the free length the same and change the attached mass. Count complete vibrations in 10 seconds, then divide by 10 to obtain frequency in Hz. A guitar player places a finger on a string and pushes it against a fret, making the vibrating length shorter. Describe how you could change the metre rule experiment to investigate the effect of length on frequency. Include the independent variable and how to change it; the dependent variable and how to measure it; control variables; and a prediction.
