![]() ![]() The diffraction pattern is changed by replacing the crystals like 3 MHz to 5MHz.The velocity of ultrasonic waves in liquids can be calculated from this experiment. This helps to direct the sodium light through the liquid and then to the detector/eyepiece conveniently by using the spectroscopic arm design. Piezo electric crystals are mounted using a kinematic holder at the centre of Goniometer. The incident and reflected waves interfere and a stationary / standing wave pattern is formed. The ultrasonic waves generated by the transducer travels through the medium (liquid) and get reflected at the side by side (flat glass plate) of the cell. Our high resolved Spectroscopic Goniometer stage helps to distinguish the fringe pattern at certain frequencies. As the sodium light is passes through the glass tank, we will observe clear higher order diffraction pattern on the eyepiece of the spectrometer. The ultrasonic diffraction experimental setup uses sodium lamp as light source. When an ultrasonic wave propagates through a medium, the molecules in that medium vibrate over very short distance in a direction parallel to the longitudinal wave. Ultrasonic sound refers to sound with a frequency greater than the human audible range (20Hz to 20 KHz). Ultrasonic diffraction apparatus is used to study diffraction of light by ultrasonic waves. Holmarc’s Ultrasonic diffraction with Goniometer (Model No :) is a standard classical diffraction experiment used in physics labs. ![]()
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