| 21. | He was a pioneer in electronic transport theory and the study of diffraction of light by ultrasonic waves.
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| 22. | This method is used to determine the velocity of ultrasonic waves using monochromatic sources like sodium vapour lamps.
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| 23. | The anti-burglary system transmits ultrasonic waves, not audible to human ear, to detect the movement of an object.
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| 24. | The system tranmits ultrasonic waves, not audible to the human ear, to detect the movement of an object.
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| 25. | In 1932 he collaborated with Peter Debye in the discovery of what is now called the ultrasonic waves.
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| 26. | Acoustic metamaterials control, direct and manipulate sound in the form of ultrasonic waves in gases, liquids and solids.
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| 27. | The further images describe the scanning electron micrographs of the influence of ultrasonic waves on the microcellular morphological attributes.
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| 28. | Ultrasonic wave nebulizers are also used in humidifiers, to spray out water aerosols to moisten dry air in buildings.
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| 29. | It sends ultrasonic waves through a Guinness-filled pint glass to recreate the beer's " surge and settle " effect.
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| 30. | The human ear cannot recognize ultrasonic waves, but animals such as bats and dogs can easily sense the ultrasonic wave.
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