Select all two-phase material systems from the list below.
Select all that apply.
O Solid Sodium Chloride (Salt, NaCl)
O Liquid Bronze (Cu + Sn Liquid Solution)
O Solid Aluminum
O Solid Lead-Tin Solder (a mixture of Pb-rich and Sn-rich Solid Solutions)
O Solid Gray Cast Iron (Ferrite Solid Solution + Embedded Graphite Flakes)
O Solid Ductile Cast Iron (Ferrite Solid Solution + Embedded Graphite Spheres)

Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.