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← ScienceWhich outcome occurs when a crystalline material experiences resonant excitation?
A)Localized heating from phonon amplification.✓
B)Uniform expansion due to thermal equilibrium.
C)Increased electrical conductivity through free electrons.
D)Spontaneous magnetization from spin alignment.
💡 Explanation
Resonant excitation causes phonon amplification, leading to intensely localized heating, because specific frequencies match lattice vibrational modes. Therefore, heat concentrates; rather than uniform expansion or increased conductivity dependent on electron mobility in the crystal structure.
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