Soft copper has a yield point that is less than what percentage of medium-hard copper?

The relationship between the yield points of soft copper and medium-hard copper is important in understanding the mechanical properties of these materials. Soft copper, known for its high ductility and malleability, typically has a lower yield strength compared to medium-hard copper, which has undergone some work hardening and thus has increased yield strength.

The correct choice indicates that the yield point of soft copper is less than 50% of that of medium-hard copper. This highlights the significant difference in their mechanical properties. When comparing materials, it is common to observe that less worked or softer materials will yield (begin to deform plastically) at lower stress levels than their harder counterparts.

In practical terms, understanding this relationship is crucial for applications that involve bending, forming, or any situation where the material may experience stress. Knowing that soft copper yields at less than half the strength of medium-hard copper allows engineers and materials scientists to appropriately choose materials for specific applications where strength and ductility are key considerations.

Thus, the identification of soft copper having a yield point at significantly less than 50% of that of medium-hard copper emphasizes the importance of selecting the right materials based on their mechanical properties for optimal performance in real-world uses.