Which effect occurs when a microwave's standing wave pattern shifts due to food placement?

💡 Explanation

When food is placed in a microwave, it alters the cavity's resonant frequencies and thus changes the standing wave pattern because the food absorbs energy at varying rates depending on its location relative to the standing wave's nodes and antinodes. Therefore uneven heating results, rather than magnetron damage, waveguide arcing, or turntable malfunction which require different electrical problems.

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