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AP Physics 2
14.6 Wave Interference and Standing Waves
14.4 Electromagnetic Waves
IntermediateMCQProportional AnalysisConceptual13.9k
A horizontal diagram of a microwave cavity bounded by two vertical thick line segments representing reflective metal walls at x = 0 and x = L. A horizontal central axis line runs between the walls. A sinusoidal wave envelope representing the electric field is drawn between the walls with nodes at both walls. Two adjacent antinodes at peaks of the wave envelope are indicated with vertical dashed lines down to a horizontal double-headed arrow labeled d_0. No other labels, lines, text, or axes appear.
Standing electric field wave inside a metallic microwave cavity.
In a microwave oven, standing electromagnetic waves are established inside a metallic cavity of length \(L\). The metallic walls act as reflective boundaries, forcing the electric field to have nodes at both ends. Food placed inside the cavity experiences maximum heating at the antinodes, which are the points of maximum electric field amplitude. When the microwave operates at a resonant frequency \(f_0\), the distance between adjacent antinodes is \(d_0\). If the operating frequency is increased to \(3f_0\), what is the new distance between adjacent antinodes?

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