Final answer:
The amplitude of waves is affected when they intersect, not only when precisely aligned, so the first statement is false. Kinetic energy is converted to potential energy as a rock rise, not the other way around, making the second statement false. Electric field lines from a positive charge radiate outward, making the third statement true.
Step-by-step explanation:
The correct answers to the questions given are as follows:
- The statement regarding wave amplitude interference is false. The amplitude of one wave is affected by the amplitude of another wave when they intersect or overlap, not only when they are precisely aligned. This phenomenon is known as interference.
- The statement about rock's kinetic and potential energy as it is thrown into the air and falls back down is false. When a rock is thrown into the air, its kinetic energy is converted into potential energy as it rises. As it falls, the potential energy is converted back into kinetic energy.
- The statement about the electric field lines from a positive point charge is true. The electric field lines from a positive point charge indeed spread out radially and point outward from the charge.