Final answer:
The statement about high-voltage wires being wrapped in insulating material is false, while the statements regarding constructive and destructive interference, as well as the use of refraction in fiber optic cables, are true.
Step-by-step explanation:
The statement regarding the high-voltage wires is false. High-voltage wires are indeed held aloft by insulators, but they are not wrapped in insulating material; they are typically bare wires. Insulating material would be impractical at the high voltages at which these wires operate; instead, the air around them acts as the insulator.
The statement about constructive and destructive interference is true. These are the two types of interference that can occur when waves meet. Constructive interference happens when wave peaks (or troughs) coincide, creating a wave of greater amplitude, while destructive interference occurs when peak meets trough, reducing or nullifying the wave's amplitude.
The statement on refraction in fiber optic cables is true. Refraction is the bending of light as it passes from one medium to another, which is essential in fiber optic technology, allowing light signals to travel with minimal loss over long distances.