Final answer:
Bakelite is the more typical choice for cassette cases due to its insulating properties, ease of molding, and cost-effectiveness, while magnesium is less common and more expensive.
Step-by-step explanation:
You asked which materials would be appropriate as cassette front materials, magnesium or bakelite. In the context of audio cassettes, which are housed in a plastic case to protect the magnetic tape inside, both materials could theoretically be used, but they serve very different purposes and have different properties.
Magnesium is a metal known for its lightness and strength, and while it is uncommon, it could be used for a cassette case for its durability. However, it's more expensive and difficult to mold compared to traditional plastics. Bakelite, on the other hand, is one of the earliest plastics and was used for a variety of applications including electronics. It's known for its insulating properties and durability, thus making it a more traditional and appropriate material for cassette cases.
In conclusion, while magnesium could be used for its durability, bakelite is the more typical choice for cassette cases due to its insulating properties, ease of molding, and cost-effectiveness.