Young's modulus rod: Hammer and rod with nodes marked.

Young's Modulus: Aluminum rod, held at a node and struck on the end, rings. The aluminum rod is held vertically at one of the nodal points (marked in black), and the end of the rod is struck by the hammer. The rod will loudly resonate at one of the harmonic frequencies for a long time. Note: There are two rods of different lengths. The rod of 152 cm. in length has a first harmonic of 1.67 KHz. The second rod of 121 cm. in length has a first harmonic of 2 KHz. It_s also possible to pinch the rod at a node and bounce it on the floor