Two strings of different liner mass densities [1 for the first string and 2 for the second] are joined together. When a wave propagates from the first string towards the second, it gets reflected par-tially. Write the expression for the reflection and transmission coefficients of the wave in terms of the two linear mass densities. Find the behaviors of these coefficients when the second string has
(a) infinitely high linear mass density, and
(b) extremely low linear mass density. Explain the physical meaning of these limits.