Hearing: What Can Humans Hear?
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How is sound measured?
To learn what we can hear, we first have to learn a little bit about sound. Find out how sound is measured and then learn how much we humans can actually hear.
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Science Trek is a local public television program presented by IdahoPTV
Major Funding by the Laura Moore Cunningham Foundation and Idaho National Laboratory. Additional Funding by 360 Immersive, the Friends of Idaho Public Television and the Corporation for Public Broadcasting.
Hearing: What Can Humans Hear?
Clip: Special | 1m 4sVideo has Closed Captions
To learn what we can hear, we first have to learn a little bit about sound. Find out how sound is measured and then learn how much we humans can actually hear.
Problems playing video? | Closed Captioning Feedback
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Science Trek
Science Trek is a place where parents, kids, and educators can watch short, educational videos on a variety of science topics. Every Monday Science Trek releases a new video that introduces children to math, science, technology, engineering, and math (STEM) career potentials in a fun, informative way.(Music) Joan Cartan-Hansen, Host: To understand what humans can hear, you have to understand a little bit about sound.
Sound is measured in two ways.
First, in pitch, how high or how low the sound is.
That's called frequency and it's measured in hertz.
Drums have a low frequency or a low pitch.
While whistles have a high frequency or a high pitch.
Human can hear from 20 to 20,000 hertz.
The other way sound is measured is how loud the sound is.
That's measured in decibels.
Humans can hear anything above zero decibels.
Refrigerators run at about 30 decibels.
Regular speech is at about 65 decibels.
And fire crackers going off are a whopping 160 decibels.
Sounds louder than 85 decibels can damage your hearing.
So, for humans to hear a sound, it has to be the right pitch or frequency and loud enough but not too loud.
For more information about hearing, check out the science trek website.
You'll find it at idahoptv.org/sciencetrek
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Science Trek is a local public television program presented by IdahoPTV
Major Funding by the Laura Moore Cunningham Foundation and Idaho National Laboratory. Additional Funding by 360 Immersive, the Friends of Idaho Public Television and the Corporation for Public Broadcasting.