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Chapter 5: Problem 42

What is the frequency of infrasonic sound?

Short Answer

Expert verified
Infrasonic sounds have a frequency range from 0.001 Hz to 20 Hz and are represented as \(f < 20 \,\text{Hz}\). These sounds are not audible to the average human ear due to their extremely low frequencies.

Step by step solution

01

Define Infrasound

Infrasound refers to sound waves with frequencies below the lower limit of human audibility. These are sounds that have a frequency lower than 20 Hz (Hertz), which is the lowest frequency the average human ear can detect.
02

Identify the Frequency Range

Infrasonic sound waves have a frequency lower than 20 Hz. Typically, the frequency range for infrasound is considered to be from 0.001 Hz to 20 Hz.
03

Express the Frequency Range of Infrasound

The frequency range of infrasonic sound can be represented as \(f < 20 \,\text{Hz}\) where \(f\) denotes the frequency in Hertz. The range starts from 0.001 Hz and goes up to, but not including, 20 Hz.
04

Conclusion

In conclusion, infrasonic sounds have a frequency range from 0.001 Hz to 20 Hz, and can be represented as \(f < 20 \,\text{Hz}\). These are sounds that are not audible to the average human ear due to their extremely low frequencies.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Frequency Range
Infrasonic sound is a subset of sound waves characterized by its specific frequency range. This range is below the threshold of human hearing, which typically starts at 20 Hz. When we talk about frequency range, especially in relation to infrasound, we refer to how low these frequencies can go. Infrasonic frequencies start as low as 0.001 Hz and extend up to just below 20 Hz. This uniquely low frequency range sets infrasound apart from ordinary audible sounds. So, in simple terms, if a sound's frequency is anywhere between 0.001 Hz and 19.999 Hz, it can be classified as infrasound.
Human Audibility
The human ear has a limited capacity for detecting sounds, largely defined by the frequency range it can perceive. This range for humans is typically from 20 Hz to about 20,000 Hz (20 kHz). Sounds with frequencies below 20 Hz are what we call 'infrasonic'. Because infrasound falls beneath this threshold, it is generally imperceptible to our ears.
However, even though we can't hear infrasonic sounds, they influence our environment and are used in various applications, including monitoring natural events like earthquakes and volcanic activity. Thus, infrasonic sounds exist outside the realm of human audibility but are still quite significant in certain scientific fields.
Sound Waves
Sound itself is a type of wave, a vibration that travels through mediums such as air, water, or solids. The concept of sound waves covers all frequencies, from infrasonic below our hearing range to ultrasonic above it.
Sound waves involve the movement of particles in a medium, creating pressure variations identifiable as sound. Infrasonic sound waves, though not heard by humans, behave like other sound waves鈥攖hey reflect off surfaces, bend around obstacles, and can interfere with each other. These wave properties allow infrasound to travel long distances, often used in monitoring systems like those for detecting tsunamis.
Hertz
Hertz (Hz) is the unit of measurement used to express frequency, which is the number of cycles a wave completes per second. Named after the German physicist Heinrich Hertz, this unit helps in quantifying the frequency of not just sounds, but also of electromagnetic waves and other oscillations.
When dealing with infrasonic sounds, we specify the frequency in Hertz to understand how these sounds compare to audible sound frequencies. For instance, an infrasonic frequency of 10 Hz indicates that the wave oscillates ten times a second, remaining undetectable to the human ear but still meaningful in fields such as seismology and animal communication.

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