In Figure an aluminum wire, of length L1 = 60.0cm, cross-sectional area 1.00 x 10-2 cm2, and

Question:

In Figure an aluminum wire, of length L1 = 60.0cm, cross-sectional area 1.00 x 10-2 cm2, and density 2.60 g/cm3, is joined to a steel wire, of density 7.80 g/cm3 and the same cross-sectional area. The compound wire, loaded with a block of mass m = 10.0 kg, is arranged so that the distance L2 from the joint to the supporting pulley is 86.6cm. Transverse waves are set up on the wire by an external source of variable frequency; a node is located at the pulley.(a) Find the lowest frequency that generates a standing wave having the joint as one of the nodes.(b) How many nodes are observed at this frequency?