Pitch, Loudness and Timbre
Frequency sets pitch, amplitude sets loudness, harmonics set timbre.
About this topic
Pitch is how high or low a note sounds and is set by frequency: higher frequency, higher pitch. Loudness depends on amplitude, measured in decibels, a logarithmic scale where +10 dB sounds about twice as loud. Timbre is the quality that distinguishes instruments playing the same note.
Timbre comes from the mix of harmonics: a violin and a flute both playing 440 Hz have the same fundamental but different overtones and attack, so a waveform on an oscilloscope has a different shape for each. Human hearing spans roughly 20 Hz to 20 kHz and 0 dB, the threshold of hearing, up to about 120 dB, the threshold of pain.
Worked example: normal conversation is about 60 dB, a busy road 80 dB, a rock concert 110 dB. Each 10 dB step multiplies intensity by 10, so 110 dB carries 100,000 times the intensity of 60 dB. Exposure above 85 dB for long periods can damage hearing permanently.
Musicians, audio engineers and doctors use these ideas to design instruments, speakers and hearing tests. A frequent mix-up is thinking loud sounds have a high pitch; a bass drum can be very loud and very low. Another is that a volume knob changes frequency, when it changes amplitude.
Key ideas
- Higher f = higher pitch
- Decibels measure loudness
- Timbre identifies instruments
Quick check
Use cases: where Pitch, Loudness and Timbre helps
- Homework: review the key idea behind Pitch, Loudness and Timbre before you start a problem set.
- Exam revision: use the quick check to test whether you can recall Pitch, Loudness and Timbre without notes.
- Visual learning: play with the interactive lab to see how Pitch, Loudness and Timbre changes when you adjust its inputs.
- Teaching a friend: explain Pitch, Loudness and Timbre in your own words, then compare your version with the key ideas.
The same laws describe car crashes, sports, satellites and everyday machines.
Frequently asked questions
What is Pitch, Loudness and Timbre?
Frequency sets pitch, amplitude sets loudness, harmonics set timbre.
What will I learn in Pitch, Loudness and Timbre?
Higher f = higher pitch. Decibels measure loudness. Timbre identifies instruments.
Is Pitch, Loudness and Timbre part of Physics?
Yes. It is one of 150 Physics topics on LearnViz HighSchoolEdu, with 3 key ideas, a live animation and a quick check.
Does the Pitch, Loudness and Timbre lab work on a phone or tablet?
Yes. The animation resizes to fit your screen and supports touch, so you can drag, tap and slide with your finger.
How should I study Pitch, Loudness and Timbre?
Read the summary and key ideas first, play with the interactive lab to see the idea in motion, then answer the quick check. If you get a question wrong, go back to the key idea it tests.
Do I need an account, and is my progress saved?
No account is needed. Marking a topic as learned is saved in your own browser, so it stays on that device and is not sent to a server.