Physics

In a series circuit, there is only a single loop for the electric charge to flow, meaning the current must be the same at all points. Distractor A is incorrect because different currents through components only occur in parallel circuits, where the current splits down multiple paths.

Multiplying a wave's wavelength by its frequency calculates how fast the wave travels through a medium, which is its speed. The period (D) is the time taken for one complete wave to pass a point, which is the reciprocal of frequency, not the product of wavelength and frequency.

Newton's second law of motion states that force equals mass multiplied by acceleration, describing how an object's motion changes when a net force is applied. A diagram for this topic isn't available yet — the worked example below walks the same reasoning step by step.

• !Hooke's law is incorrect because it relates force to the extension of a spring, represented by F = ke.
• !Distractor A is incorrect because different currents through components only occur in parallel circuits, where the current splits down multiple paths.
• !Kinetic energy (A) is incorrect because it is the energy stored in moving objects, whereas this spring is stationary but under tension.
• !The period (D) is the time taken for one complete wave to pass a point, which is the reciprocal of frequency, not the product of wavelength and frequency.
• !In contrast, protons carry a positive charge (A) and electrons carry a negative charge, making those options incorrect.

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