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27 November, 10:12

Which of the following statements is an accurate description of vibrations?

A. The frequency of infrasonic vibrations is much too high to be heard by humans.

B. Neither ultrasonic nor infrasonic vibrations can be heard by humans.

C. Infrasonic vibrations are used in sonar equipment as well as to detect flaws in steel castings.

D. Ultrasonic vibrations have a frequency lower than the range for normal hearing.

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  1. 27 November, 10:40
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    The accurate description of vibrations is that, neither ultrasonic nor infrasonic vibrations can be heard by humans. The Infrasonic vibration frequency is lower than 20Hz, whereas ultrasonic vibration frequency is greater than 20,000Hz. The normal range of frequency of hearing for humans is only 20Hz-20,000Hz.
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