The question that would NOT aid her in learning about the properties of both mechanical and electromagnetic waves is:
What is the wave speed in a vacuum?
This question is specific to electromagnetic waves, as they can propagate in a vacuum (at the speed of light), while mechanical waves require a medium (like air, water, or solids) to travel and therefore do not have a speed in a vacuum. The other questions regarding amplitude, wavelength, and frequency apply to both types of waves.
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