The frequency of infrasound waves is
Infrasound waves have frequencies less than 20 Hz. They are below the threshold of human hearing, which ranges from 20 Hz to 20,000 Hz. Infrasound can be generated by natural events such as earthquakes and volcanic eruptions, as well as by artificial sources like explosions and machinery.
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Infrasound waves are characterized by frequencies that are less than 20 Hz, which is below the lower limit of human hearing. Humans can typically hear sounds in the range of 20 Hz to 20,000 Hz, and sounds with frequencies higher than this range are termed ultrasound. Infrasound can be produced by various natural phenomena such as earthquakes, volcanic eruptions, and ocean waves, as well as by artificial sources including explosions, heavy machinery, and certain types of industrial equipment. These low-frequency sounds can travel long distances and penetrate through different mediums, making them useful in applications like monitoring geophysical events and studying animal communication. Because of their low frequency, infrasound waves are less attenuated by the medium they travel through, allowing them to be detected over large distances. Therefore, the correct answer regarding the frequency of infrasound waves is; option [A] Less than 20 Hz.