Chemistry, 03.02.2020 21:57 xczapien782

Which of the following statements is true of vibrations? a. the frequency of infrasonic vibrations is much too high to be heard by humans. b. infrasonic vibrations are used in sonar equipment and to detect flaws in steel castings. c. ultrasonic vibrations have a frequency lower than the range for normal hearing. d. neither ultrasonic nor infrasonic vibrations can be heard by humans

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