The fundamental frequency of vibration of a string stretched between two rigid support is \( 50 \, \text{Hz} \). The mass of the string is \( 18 \, \text{g} \) and its linear mass density is \( 20 \, \text{g/m} \). The speed of the transverse waves so produced in the string is __________ \( \text{ms}^{-1} \).
