In a two-point source ripple tank experiment, what do the dark lines between the waves represent?

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BlackTom AI · Accepted Answer

Question restatement: In a two-point source ripple tank experiment, what do the dark lines between the waves represent?

Option a: Regions of high amplitude.
- This is incorrect because the dark lines in a ripple tank typically indicate nodes where the wave displacement is minimal, not regions of high amplitude. High amplitude correspond to antinodes, which appear as bright or strong regions depending on the visualization, not dark lines.

Option b: Nodal lines from destructive interference.
- This is correct. The dark lines mark positions where the two waves from the two sources arrive out of phase and interfere destructively, producing near-zero net displacement. These are the nodal lines where the amplitudes cancel.

Option c: Antinodal lines from constructive interference.
- This is incorrect. Antinodes occur where the interference is constructive and the amplitude is maximal. In a typical ripple tank visualization, these appear as the brightest or most pronounced regions, not the dark lines.

Option d: Areas where refraction occurs.
- This is incorrect in the context of a standard ripple tank with two coherent point sources. Refraction is a different phenomenon related to wave bending at boundaries with changing media, not the dark interference lines produced by two point sources.

Summary of reasoning: The dark lines between the waves correspond to locations where the two wavefronts cancel each other due to destructive interference, i.e., nodal lines. Other options misidentify the nature of the lines (high amplitude/antinodes) or misapply the concept to refraction phenomena rather than interference.

SPH4U - Physics 12 (2025-26) - A

In a two-point source ripple tank experiment, what do the dark lines between the waves represent?

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