Final answer:
High-voltage wires are not wrapped in insulating material; this is false. It is true that waves with different frequencies can superimpose, creating complex patterns due to the principle of superposition.
Step-by-step explanation:
Regarding question 16, the statement that high-voltage wires wrapped in an insulating material is false. High-voltage wires, the ones often seen stretching between tall metal-frame towers, are indeed held aloft by insulators, but these wires themselves are not wrapped in insulation.
This is because the air space around the wires serves as a natural insulator, and wrapping them would be impractical due to the high voltages involved, which can cause the insulation materials to degrade rapidly.
For question 56, it is true that waves can superimpose if their frequencies are different. This phenomenon is known as superposition and is a principle of wave interference. When two waves meet, they combine to form a new wave pattern.
This interaction can occur regardless of whether the waves have the same or different frequencies. However, when the frequencies differ, the resultant wave pattern will vary over time, leading to complex interference patterns such as beats.
Therefore answer is b) False.