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Ultrasonic Grating Apparatus is a unique demonstration of the interaction of longitudinal sound waves and transverse light waves and also a method for the precise determination of the speed of sound in liquids.

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The Ultrasonic Grating Apparatus is both a unique demonstration of the interaction of longitudinal sound waves and transverse light waves and also a method for the precise determination of the speed of sound in liquids. Distilled water and ethanol are suitable starting liquids. The core of this apparatus is a parallel-sided glass tank that houses the liquid sample and contains a lead zirconate titantate ultrasonic transducer. Resonances can be found to set up a standing wave field in the liquid, which results in a periodic variation of the liquid’s refractive index along the tank. If a parallel light beam is shone through the tank normally to the standing wave field, the liquid acts as a diffraction grating, producing fringes that can be measured with a micrometer eyepiece. In practice, the eyepiece is focused on the source slit and the exciting RF frequency is adjusted until the interference fringes appear.

Contents include: • Optical bench, 1,000 mm • Riders (lateral adjustment and plain) • Micrometer eyepiece, eyepiece adapter ring and eyepiece holder • Glass tank for HF grating • HF generator and frame • Optical table • Lenses and lens holder • Mercury lamp, 20 W, 110 V