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← ScienceWhich acoustic consequence results when active noise cancellation utilizes signal coherence?
A)Destructive interference reduces sound amplitude✓
B)Diffraction increases the signal wavelength
C)Reflection boosts the original sound wave
D)Harmonic distortion alters the timbre
💡 Explanation
Active noise cancellation uses destructive interference to cancel sound waves. Signal coherence is key; the generated ‘anti-noise’ must be phase-shifted. Therefore, sound amplitude diminishes; rather than creating reflection or altering timbre, cancellation requires precise opposition.
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