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A short class with Sarah and her students. The other ways are under More.
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Let's discuss audible sounds first. Can anyone tell me what frequencies are considered audible for humans?
Is it between 20 Hz and 20,000 Hz?
Exactly! This range indicates the sounds we can hear. Remember the acronym 'Remember All Frequencies: 20-20K' to recall this range.
But why can't we hear sounds lower than 20 Hz?
Great question! Sounds below this range are known as infrasonic sounds, which we can't perceive due to the limitations of our hearing ability.
What’s an example of infrasonic sound?
Infrasonic sounds include natural phenomena like earthquakes. Let's summarize: audible sounds are between 20 Hz and 20,000 Hz, and anything below is infrasonic!
Now let’s dive into infrasonic sounds. What can you tell me about them?
They are sounds below 20 Hz that humans cannot hear.
Correct! Why do you think some animals can detect these sounds?
Maybe they have better hearing capabilities?
Yes! Animals like elephants use infrasound to communicate over long distances. Remember: 'Elephants Feel Low Frequencies'—this could help you recall their connection!
That’s fascinating! Are there any risks associated with such sounds?
In certain cases like earthquakes or explosions, they can have severe effects—physically and emotionally—on both humans and animals.
Next, let's explore ultrasonic sounds. Who can define what they are?
They are sounds above 20,000 Hz that we cannot hear.
Exactly! Can you think of any animals that can hear ultrasonic sounds?
Bats! They use echolocation, right?
Exactly! Bats use ultrasonic sounds to navigate and hunt in the dark. To remember, use the phrase 'Bats Navigate Up High!' Do you remember any technological applications of ultrasonic sounds?
Ultrasound imaging in medicine!
Correct! It's used for safely viewing internal body structures. So, to recap, ultrasonic sounds are above 20,000 Hz and are utilized in echolocation and medical imaging.
The range of frequencies that humans can hear, which is from 20 Hz to 20,000 Hz.
Sounds that have frequencies below 20 Hz and are inaudible to humans.
Sounds that have frequencies above 20,000 Hz, also inaudible to humans but detectable by some animals.
For sounds we can hear, from 20 to 20K, They make us cheer!
Imagine a bat flying high, using sounds no human can spy, And an elephant below can feel, the low sounds that are real.
Use 'I Hear U' to remember: I (Infrasonic) is low, H (Hear) is audible, U (Ultrasonic) is high.
A.I.U. - Audible, Infrasonic, Ultrasonic.
Term
Audible Sounds
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Term
Infrasonic
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Term
Ultrasonic
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This section discusses the range of sound frequencies audible to humans and distinguishes between audible sounds and those that are inaudible, such as infrasonic and ultrasonic sounds.
This section explains that human ears can perceive sounds within a frequency range of 20 Hz to 20,000 Hz, distinguishing them as audible sounds. It also covers infrasonic sounds (below 20 Hz) and ultrasonic sounds (above 20,000 Hz), highlighting examples of animals that can detect these sounds.
Sound frequencies are categorized based on their audibility to humans. The audible range for human ears spans from 20 Hz to 20,000 Hz, meaning sounds within this frequency range can be heard by most human beings. Frequencies below 20 Hz are known as infrasonic sounds, which are typically not detectable by humans but can be sensed by certain animals. Conversely, frequencies exceeding 20,000 Hz are labeled as ultrasonic sounds. Notably, some animals, including dogs and bats, possess the ability to hear these ultrasonic frequencies, highlighting the diverse capabilities of auditory perception across species. Understanding the distinctions between these sound categories is crucial in various fields, including acoustics, animal behavior, and sound engineering.