Heat

A calorimeter is designed to minimize heat exchange with the surroundings. The primary modes of heat loss are conduction, convection, and radiation. The lid covers the top opening of the calorimeter. This traps the air (or vapor) above the hot liquid, preventing it from rising and being replaced by cooler air from the surroundings. This process of heat transfer through fluid movement is called convection. Therefore, the lid's main function is to minimize heat loss by convection.

Step 1: Understanding the Question:
The question asks about the change in the specific heat capacity of a metallic wire when it is stretched to twice its original length.
Step 2: Detailed Explanation:
Specific heat capacity is an intrinsic property of a substance. This means it depends on the nature of the material itself (i.e., the type of atoms/molecules and their bonding) and not on the mass, shape, or dimensions of the object.
Properties like resistance, length, and volume are extrinsic properties, as they depend on the size and shape of the object.
When the metallic wire is stretched, its length, cross-sectional area, and resistance will change. However, the material of the wire remains the same. Since specific heat capacity is a characteristic of the material, it does not change.
Therefore, even after being stretched, the specific heat capacity of the metallic wire will remain the same as it was originally.
Step 3: Final Answer:
Stretching the wire changes its physical dimensions but not the substance it is made of. Specific heat capacity is a property of the substance, hence it remains unchanged.