Answer:
longitudinal
Explanation:
the wave travels in the same direction as the movement from the person
Ever heard of this thing called... RESEARCH!? You might want to try it buddy. Sayounara.
To be able to answer this, you need to have a phase diagram of Cu-Ni alloy. Create a vertical line along 40% in the x-axis. Then, create a horizontal line along the temperature at 1,300°C. The intersection lies outside of the α-L boundary.
<em>Therefore, the system consist solely of the L-phase: 100% L.</em>