- #1
e.chaniotakis
- 80
- 3
Hello everybody.
I am involved in a project aiming to address Physics Misconceptions regarding Sound through the creation of virtual musical instruments.
One of the major student misconceptions I have found in bibliography is the fact that students perceive sound pitch and loudness as being the same. As I try to formulate educational activities aiming to address these misconceptions, I came by M. Allen's "Misconceptions in Primary Science" which states:
"Sounds have different pitches because they have different wavelengths and sounds have differing loudness because they have different amplitudes".
Such a statement is totally wrong from my point of view.
Pitch depends only on frequency. Loudness on the other hand is an empirical measure of the intensity of sound, ergo, the energy of sound waves arriving at a 1m^2 area per second.
The energy of sound waves is proportional to the square of the amplitude times the square of the frequency.
This implies that varying the frequency of a sound while keping the amplitude constant (e.g in a tone generator) we expect to see variations in the sound intensity (confirmed).
What is your opinion on this?
Thank you
I am involved in a project aiming to address Physics Misconceptions regarding Sound through the creation of virtual musical instruments.
One of the major student misconceptions I have found in bibliography is the fact that students perceive sound pitch and loudness as being the same. As I try to formulate educational activities aiming to address these misconceptions, I came by M. Allen's "Misconceptions in Primary Science" which states:
"Sounds have different pitches because they have different wavelengths and sounds have differing loudness because they have different amplitudes".
Such a statement is totally wrong from my point of view.
Pitch depends only on frequency. Loudness on the other hand is an empirical measure of the intensity of sound, ergo, the energy of sound waves arriving at a 1m^2 area per second.
The energy of sound waves is proportional to the square of the amplitude times the square of the frequency.
This implies that varying the frequency of a sound while keping the amplitude constant (e.g in a tone generator) we expect to see variations in the sound intensity (confirmed).
What is your opinion on this?
Thank you