Which frequency is classified as infrasound?

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Multiple Choice

Which frequency is classified as infrasound?

Explanation:
Infrasound refers to sound waves with frequencies below the lower limit of human hearing, which is typically around 20 Hz. This range includes various natural phenomena, such as earthquakes, volcanic eruptions, and certain weather patterns, as well as man-made sources like explosions or machinery. The frequency of 15 Hz falls within this infrasound category, making it the correct choice for this question. It is lower than the threshold of human hearing, allowing it to be classified as infrasound. Other frequencies listed, such as 1.5 kHz, 25 Hz, and 1 MHz, either fall into the audible range or well above it, with 1.5 kHz and 1 MHz being in the ultrasonic range, while 25 Hz is still technically within the low-frequency domain, it is above the infrasound threshold. Thus, 15 Hz is the only frequency among the choices that is properly categorized as infrasound.

Infrasound refers to sound waves with frequencies below the lower limit of human hearing, which is typically around 20 Hz. This range includes various natural phenomena, such as earthquakes, volcanic eruptions, and certain weather patterns, as well as man-made sources like explosions or machinery.

The frequency of 15 Hz falls within this infrasound category, making it the correct choice for this question. It is lower than the threshold of human hearing, allowing it to be classified as infrasound.

Other frequencies listed, such as 1.5 kHz, 25 Hz, and 1 MHz, either fall into the audible range or well above it, with 1.5 kHz and 1 MHz being in the ultrasonic range, while 25 Hz is still technically within the low-frequency domain, it is above the infrasound threshold. Thus, 15 Hz is the only frequency among the choices that is properly categorized as infrasound.

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