A long string of mass per unit length 0.2kg m–1 is stretched to a tension of 500 M. Find the speed of transverse waves on the string and the mean power required to maintain a travelling wave of amplitude 10 mm and wavelength 0.5 m. The string is joined to another, of mass per unit length 0.8kg m–1. What fraction of the power carried by the wave is transmitted to the second string?