Physics Lesson 11.5.3 - Limits of Audibility. Audible Sound. Infra and Ultrasound<

[ 1 Votes ]

Welcome to our Physics lesson on Limits of Audibility. Audible Sound. Infra and Ultrasound<, this is the third lesson of our suite of physics lessons covering the topic of Sound Waves. Intensity and Sound Level, you can find links to the other lessons within this tutorial and access additional physics learning resources below this lesson.

Limits of Audibility. Audible Sound. Infra and Ultrasound

Humans are able to hear sounds of frequency ranging from 20 Hz to 20 kHz (20 000 Hz). These values are known as the limits of audibility. This means sound waves, which have a frequency within this range, are audible by humans.

Sound waves of a lower frequency than 20 Hz are known as infrasounds. We cannot hear them as their frequency is smaller than our lower limit of audibility. Infrasound are not used in technology as the energy they carry is practically zero.

On the other hand, sound waves with frequency higher than 20 kHz are known as ultrasound. They are widely used in technology such as in ultrasound screening (echoes), ultrasound detectors, ultrasound distance meters (when calculating the ocean depth), etc. We cannot hear ultrasound as the eardrum of humans can vibrate up to 20 000 times per second (20 kHz).

Hearing ability of a human decrease by aging. The maximum values can be reached around the age of 10.

You have reached the end of Physics lesson 11.5.3 Limits of Audibility. Audible Sound. Infra and Ultrasound<. There are 7 lessons in this physics tutorial covering Sound Waves. Intensity and Sound Level, you can access all the lessons from this tutorial below.

More Sound Waves. Intensity and Sound Level Lessons and Learning Resources

Waves Learning Material
Tutorial IDPhysics Tutorial TitleTutorialVideo
Tutorial
Revision
Notes
Revision
Questions
11.5Sound Waves. Intensity and Sound Level
Lesson IDPhysics Lesson TitleLessonVideo
Lesson
11.5.1Things You Already Know About Sound Waves
11.5.2Things You Need To Know About Sound Waves
11.5.3Limits of Audibility. Audible Sound. Infra and Ultrasound<
11.5.4Echo
11.5.5Intensity of Sound Waves
11.5.6Sound Level
11.5.7Loudness and Pitch

Whats next?

Enjoy the "Limits of Audibility. Audible Sound. Infra and Ultrasound<" physics lesson? People who liked the "Sound Waves. Intensity and Sound Level lesson found the following resources useful:

  1. Audible Feedback. Helps other - Leave a rating for this audible (see below)
  2. Waves Physics tutorial: Sound Waves. Intensity and Sound Level. Read the Sound Waves. Intensity and Sound Level physics tutorial and build your physics knowledge of Waves
  3. Waves Revision Notes: Sound Waves. Intensity and Sound Level. Print the notes so you can revise the key points covered in the physics tutorial for Sound Waves. Intensity and Sound Level
  4. Waves Practice Questions: Sound Waves. Intensity and Sound Level. Test and improve your knowledge of Sound Waves. Intensity and Sound Level with example questins and answers
  5. Check your calculations for Waves questions with our excellent Waves calculators which contain full equations and calculations clearly displayed line by line. See the Waves Calculators by iCalculator™ below.
  6. Continuing learning waves - read our next physics tutorial: Electromagnetic Waves. Light

Help others Learning Physics just like you

[ 1 Votes ]

We hope you found this Physics lesson "Sound Waves. Intensity and Sound Level" useful. If you did it would be great if you could spare the time to rate this physics lesson (simply click on the number of stars that match your assessment of this physics learning aide) and/or share on social media, this helps us identify popular tutorials and calculators and expand our free learning resources to support our users around the world have free access to expand their knowledge of physics and other disciplines.

Waves Calculators by iCalculator™