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| The oscillations observed at half the difference in frequency between two superposed signals. If x = sin(ω1t) and y = sin(ω2t), then x + y =2 sin [½ (ω1 + ω2)t] cos [½ (ω1 - ω2)t]. |
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| Other Terms : common salt | low-energy electron diffraction (LEED) | oscillator
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