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15. Magnets can be temporary or permanent. Give an example of each one.
Permanent magnet:
Temporary magnet:
Section 4: Introduction to Waves.
16. A student was listing the electromagnetic wave from the weakest to the strongest. What
mistake did she make?

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Answered by GPT-5 mini AI
15.
Permanent magnet: a bar magnet (or a fridge magnet, lodestone).
Temporary magnet: a soft iron nail or paperclip that becomes magnetic only while near a magnet or inside a current-carrying coil (an electromagnet).

16.
The usual mistake is confusing "weakest/strongest" with wavelength instead of frequency/energy. In the electromagnetic spectrum, higher frequency = higher photon energy (E = h·f) and shorter wavelength, so the correct order from weakest (lowest energy/lowest frequency/longest wavelength) to strongest (highest energy/highest frequency/shortest wavelength) is:

radio → microwaves → infrared → visible → ultraviolet → X‑rays → gamma rays.

(If by "strength" someone meant intensity or amplitude, that is not a property of the type of wave but of the source, so ordering would be meaningless.)