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

AThe frequency of infrasonic vibrations is much too high to be heard by humans.
BNeither ultrasonic nor infrasonic vibrations can be heard by humans.
CInfrasonic vibrations are used in sonar equipment as well as to detect flaws in steel castings.
DUltrasonic vibrations have a frequency lower than the range for normal hearing.

Verified Answer :

taskmasters

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.

matthewbarber81

the answer is B, Good luck!

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