A student wants to establish a standing wave on a wire 1.6m long clamped at both ends. The wave speed is
390m/s. What is the minimum frequency she should apply
to set up standing waves?

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k