WAEC Physics 2020 Paper

Concept:The frequency of a vibrating string depends on its length, tension, and mass per unit length.Explanation:For a stretched string, the fundamental frequency is given by:$$f = \frac{1}{2L}\sqrt{\frac{T}{\mu}}$$where $L$ is the vibrating length, $T$ is the tension, and $\mu$ is the mass per unit length of the string.From this formula, frequency is inversely proportional to length and to the square root of mass per unit length.Frequency is directly proportional to the square root of tension.Therefore, the factors are length, tension, and mass per unit length.Answer:C. Mass per unit length of string, tension in string, and length of string.