This is a question about beats I need some help please. Thanks?! :)
1 Answer
Imagine you have two speakers producing sound at two slightly different frequencies, say 200 and 205 Hz.
Explanation:
If you sit still in a room with few echoes (reflected sound waves) you will notice an odd effect - the sound varies in loudness (amplitude) with a frequency of 5 Hz. You hear a ‘wobble’ common to people who have tuned a guitar by using the lowest tension (bass) string.
Alternatively, if you produce a single frequency from two speakers in a room with similarly few echoes and walk towards the sound sources you will also hear “beats” every 1/2 wavelength of distance travelled.
The same explanation works for both scenarios- you are listening to sound waves interfering constructively and destructively (often called the ‘superposItion’ of waves.)
This website provides a much better resource: http://www.physicsclassroom.com/class/sound/Lesson-3/Interference-and-Beats
