Sound waves of a frequency beyond the hearing range of the human ear are referred to as ultrasonic waves or vibrations, and the term embraces all vibrational waves of frequency greater than approximately:

Related MCQs

• AA material used between the face of a search unit and the test surface to permit or improve the transmission of ultrasonic vibrations from the search unit to the material being tested is called:
• The velocity of surface waves is approximately shear waves in the same material.
• Sound waves which travel on the surface of a solid in a manner similar to waves on a water surface are called:
• Addition of approximately 6% antimony as an alloying element could be expected to increase the ultrasonic inspectability of which of the following materials?
• When an ultrasonic beam passes through the interface between two dissimilar materials at an angle, a new angle of sound travel is formed in the second material due to:
• The radiation from 37 GBq (1 Ci) of Co-60 (0.145 Gy or 14.5R at 30.5 cm or 1 foot) is attenuated in air to approximately 5mR/h at a distance of approximately:
• The piezoelectric material in a search unit which vibrates to produce ultrasonic waves is called:
• Shear waves for ultrasonic testing are usually produced:
• Which of the following methods are used to produce ultrasonic waves?
• Which of the following is the least efficient generator of ultrasonic waves: