Task: Text Categorization
Input (English): The Debye-Sears effect concerns materials exhibiting this effect that are placed in a liquid and vibrated at a fixed frequency, in which they set up acoustic waves. Trigonal crystals exhibiting it are especially useful in the eponymous oscillator. The reverse version of the effect is also useful, and occurs when a potential difference is applied to materials that exhibit it, such as barium titanate, Rochelle salts, and quartz. FTP, what is this effect, the generation of a potential difference in certain non-conducting crystals that are subjected to stress
Output (English): Science