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A line provides Wavelength in nanometers for “400,” “500,” “600,” and “700” nanometers. Within this line are all of the colors of the visible spectrum. Below this line, labeled from left to right are “Cosmic radiation,” “Gamma rays,” “X-rays,” “Ultraviolet,” then a small callout area for the line above containing the colors in the visual spectrum, followed by “Infrared,” “Terahertz radiation,” “Radar,” “Television and radio broadcasting,” and “AC circuits.”
Different wavelengths of light are associated with our perception of different colors. (credit: modification of work by Johannes Ahlmann)

Sound waves

Like light waves, the physical properties of sound waves are associated with various aspects of our perception of sound. The frequency of a sound wave is associated with our perception of that sound’s pitch    . High-frequency sound waves are perceived as high-pitched sounds, while low-frequency sound waves are perceived as low-pitched sounds. The audible range of sound frequencies is between 20 and 20000 Hz, with greatest sensitivity to those frequencies that fall in the middle of this range.

As was the case with the visible spectrum, other species show differences in their audible ranges. For instance, chickens have a very limited audible range, from 125 to 2000 Hz. Mice have an audible range from 1000 to 91000 Hz, and the beluga whale’s audible range is from 1000 to 123000 Hz. Our pet dogs and cats have audible ranges of about 70–45000 Hz and 45–64000 Hz, respectively (Strain, 2003).

The loudness of a given sound is closely associated with the amplitude of the sound wave. Higher amplitudes are associated with louder sounds. Loudness is measured in terms of decibels (dB) , a logarithmic unit of sound intensity. A typical conversation would correlate with 60 dB; a rock concert might check in at 120 dB ( [link] ). A whisper 5 feet away or rustling leaves are at the low end of our hearing range; sounds like a window air conditioner, a normal conversation, and even heavy traffic or a vacuum cleaner are within a tolerable range. However, there is the potential for hearing damage from about 80 dB to 130 dB: These are sounds of a food processor, power lawnmower, heavy truck (25 feet away), subway train (20 feet away), live rock music, and a jackhammer. The threshold for pain is about 130 dB, a jet plane taking off or a revolver firing at close range (Dunkle, 1982).

This illustration has a vertical bar in the middle labeled Decibels (dB) numbered 0 to 140 in intervals of 20 from the bottom to the top. To the left of the bar, the “sound intensity” of different sounds is labeled: “Hearing threshold” is 0; “Whisper” is 30, “soft music” is 40, “Risk of hearing loss” is 110, “pain threshold” is 130, and “harmful” is 140. To the right of the bar are photographs depicting “common sound”: At 20 decibels is a picture of rustling leaves; At 60 is two people talking, at 80 is a car, at 90 is a food processor, at 120 is a music concert, and at 130 are jets.
This figure illustrates the loudness of common sounds. (credit "planes": modification of work by Max Pfandl; credit "crowd": modification of work by Christian Holmér; credit "blender": modification of work by Jo Brodie; credit "car": modification of work by NRMA New Cars/Flickr; credit "talking": modification of work by Joi Ito; credit "leaves": modification of work by Aurelijus Valeiša)

Although wave amplitude is generally associated with loudness, there is some interaction between frequency and amplitude in our perception of loudness within the audible range. For example, a 10 Hz sound wave is inaudible no matter the amplitude of the wave. A 1000 Hz sound wave, on the other hand, would vary dramatically in terms of perceived loudness as the amplitude of the wave increased.

Of course, different musical instruments can play the same musical note at the same level of loudness, yet they still sound quite different. This is known as the timbre of a sound. Timbre refers to a sound’s purity, and it is affected by the complex interplay of frequency, amplitude, and timing of sound waves.

Summary

Both light and sound can be described in terms of wave forms with physical characteristics like amplitude, wavelength, and timbre. Wavelength and frequency are inversely related so that longer waves have lower frequencies, and shorter waves have higher frequencies. In the visual system, a light wave’s wavelength is generally associated with color, and its amplitude is associated with brightness. In the auditory system, a sound’s frequency is associated with pitch, and its amplitude is associated with loudness.

Personal application question

If you grew up with a family pet, then you have surely noticed that they often seem to hear things that you don’t hear. Now that you’ve read this section, you probably have some insight as to why this may be. How would you explain this to a friend who never had the opportunity to take a class like this?

Got questions? Get instant answers now!

Questions & Answers

I was recently diagnosed schizophrenic. after a lifetime of major depression. time I did hear voices not for long. how does one know if they really schizophrenic?
Cathy Reply
because psychology is the dissection and study of the mind, some find it hard to believe a diagnosis under mental health concerns. if you feel you have been misdiagnosed, go to another doctor. be 100% honest in all questions asked. to lie to your doctor is much like lying to yourself/hurting self
on the contrary, a diagnosed schizophrenic doesn't always have episodes. it may start off very mild and progress over time. it may also be triggered by events/situations/certain states of mind the patient may experience
diagnosed schizophrenics are normally prescribed a medication that can help. if you feel your medication is not working, or that it may make matters worse, discuss this with your doctor so he/she can make adjustments. what works for one person may not work for them all, and so doctors need to know
please whats the answer
Fortune Reply
answer to what?
Gaunt
what is mean by what?
Mohammad
to the questions ooo i can't find the answers
Fortune
Can you repeat the question or comment the page you saw it?
Haim
why they named it psychology
zayn Reply
telll me
ABDUL
the word "psychology" comes from the Greek words "psyche" meaning life and "logos" meaning "explanation".
Soma
Psyche, in Greek mythology was a goddess who comes to represent the human soul's triumph over the misfortunes of life. The term psychology was coined. Psyche, meaning soul or mind and the root "ology" meaning the study of. I hope this helped.
JC
well done
ABDUL
what is chunking
Ritika Reply
Chunking is a process by which individual pieces of an information set are broken down and then grouped together in a meaningful whole.
Azquan
chunking is to information as syllabus is to word
ABDUL
what dose it means, operant and classic conditioning in short words?
Mikiyas Reply
scientific method, critical thinking.
jeddy Reply
the dealings with the thought process and human behavior.
jeddy
for acquiring knowledge by experimentation.
jeddy
study scientific study of mind and behavior.
jeddy
scientific study of the human mind and behavior.
jeddy
hey jeddy I have question s for you
Yussuf
hi what is behavioralism ?
jusem
what is psychology..?
Ania
the science of mental life.
Mikiyas
it focuses on understanding and modifying human behaviour
ABDUL
because emotion can't be measured.
marikrizz Reply
only by the person having the emotion.
Jason
it is subjective feeling
suman
only placed within levels of itself
Teena
and accepted as extended or beginning versions of emotions that are completely free of restrictions
Teena
anyone know, (2+2)/2
start
Emotions can't be measured, but they can be recognized. To be able to recognize certain characteristics that'll give me an idea about an individual's state of mind.
jeddy
any one knows (2+2)/2
start
it is 6
suman
anyone (2+2)/2
start
2
fadil
😂
suman
then more then just recognize but to comprehend the emotions being observed separating your own emotions from the situation currently in.. and rationally gaging the environment.. while then pulling each possible emotional vibe or energy exerted from the human being observed
Teena
How does learning influence behaviour
Tumpa Reply
our choice of study molds us and encourages us to practice what we learn. social structure also changes behavior based on the environment and peers. how we learn can be experimental as not everyone lesrns the same. some are more of a hands-on absorber, whereas others may learn better from listening
A confidence from personal knowledge. Not from having been taugbt. knowledge that you learned what was taught.
jeddy
life is choice, be ready for the best and be prepare for what yet to come in your way(Destiny)
Wayne
what is development
Momna Reply
In what Context are you referring to
Hassan
the progression/degression/growth of something. it is interpreted most commonly in psychology as how something is created or formed. ex: When did you develop an interest in psychology?
when refering to physical, cognitive, and social development, these types of development are determined by many circumstances. such as demographics, biology, and personality/character
it is the apprehensions fluency based by the process of configurations to a design based on product/witness series noticeboards to note the stats on order to retail agreements on stated series order.
Kay
Evolving
jeddy
I'm on my first year of a psychology course, is there anything I should know? anything you wished you knew when you just started psychology ? because I feel like I'm walking into all of this blindly
Lia Reply
hello
GOPAL
I feel exactly the same. Just about to start Psychology and Criminology. feeling slightly nervous 🙈
Sarah
and everything is online
Lia
only for a few weeks I believe. Unless I have read it wrong. I believe that they will try and filter everyone in.
Sarah
it's different for every country
Lia
hi
GOPAL
I start 9/14. Online as well.
LaQuisha
I know very little about Psychology
GOPAL
which area are you specialising in
Elle
yeah, everthing your just know, that psychology is everthing come out with, mind, behavior and emotion. and believe, once you study it, you will understand, wjy people act like that.
EDWARD
Don't be in the class with pre notions.. yh
ABDUL
after a successful job interview,Mr.Abhishek felt relaxed and calm,he stopped sweating and felt hungry,which part of his nervous system was activated
Babaljeet Reply
Hypothalamus
Words
what is the Borysenko model and why is it important?
Sarah
It explains the link between stress and diseases ie.. How long term stress on the mind or body can lead to chronic migraines, ulcers, depression...
Jennifer
I understand there is a link between stress and illness and disease. that when you are in high-stress situations for prolonged periods of time that the brain releases an abundance of stress hormones such as epinephrine, norepinephrine, cortisol, and aldosterone. idk anymore than that.
Sarah
what is the strees anger
Divya
what is difference between illness and disease
Umair
anyone knows (2+2)/2
start
Hy everybody any one who can help me to understand the concept of Structuralism in easy words?
sabiha Reply
If you really considered looking into yourself find the reason of the possibilities or the environment and atmosphere in which you're placed with or without choice in voluntary or involuntary from birth to now, and also consider all existential extensions of yourself including spiritual recognition.
Darling
? and compare them to social,judicial, learned events,experiences, influences and dive into there branches? somehow reflects our mechanic motivations and has an effect on who we are and what we represent. ?😲
Darling
critical evaluation on attitude change and formation those that even exist
COMORDOR
who is considered of a father of psychology
Satyendra Reply
Freud
Lithemba
Immanuel Kant: Critique of Pure Reason.
David
wundt
Namrata
Wundt
Disha
wundt
NishaOfficial
wundt
Naheed
wundt
Jasmine
id say freud but wundt continued his work. let's face it without freud there wouldn't be a psychology practices
Michelle
Freud is considered as the father of Psychoanalysis not psychology
Indefatigable
technically Freud would be the father of psychology because he discovered the id ego and super ego
Bryce
Its kind of a loaded question. There are many early greats in psychology each having their own theories and views. I think it is more of a collective of ideals that make up our current view and understanding of psychology.
Jason
I agree with you Jason. there are Amazing psychologist back then that made the foundation for the field of psychology
Bryce
Wilhelm Winston ryt
Faazi
Wundt
Waris
i agree to you Jason
Welli
is there any name for the fear of dying painfully? is it the same as thanatophobia?
Matthew Reply
hello matthew i am new
Barbara
who is reinhart
Hannah Reply
hello, why are you asking me this?
She
hello, how are you?
Corey
hey Corey, all fine, how are you doing?
She
Hello everyone
Indefatigable
hello
Hannah
Which specialization in psychology interest you? why?
Ailyn
hello, hannah, I'm fine thanks and how are you?
Corey
or she
Corey
hello hannah and corey
Barbara

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Source:  OpenStax, Psychology. OpenStax CNX. Feb 03, 2015 Download for free at https://legacy.cnx.org/content/col11629/1.5
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