1. The article discusses the unexploited piezoelectric properties of semiconductors, particularly those of gallium arsenide and cadmium sulphide. 2. By forming a depletion layer, these properties can be utilized to maintain high electric field strengths required for observing piezoelectric effects. 3. Resonant frequencies ranging from 300Mc/s to over 1,000 Mc/s are achievable, with ongoing research at Bell Telephone Laboratories aimed at increasing frequency and bandwidth.