# Sound waves: frequency, speed, and wavelength

I need to understand the relationship between the three. When does the wavelength stay the same as there is a change in one of the other two variables? When does it change as there is a change in one of the other variables? My understanding is this: If the speed changes due to a shift in the medium, let's say increases, only frequency increases.

But if the frequency changes due to a change in the source of vibrations, wavelength would change to compensate for it, since there is no change in medium, correct?

I just need to know if this is right, because I am not sure if I am getting it, and if there is anything about this relationship that I am missing. Thank you:)

• When you say "speed" do you mean the speed of sound (eg because it goes from one medium to another) or the speed of the source (as in Doppler effect). You question is confusing - presumably because you yourself are confused. – Floris Dec 11 '16 at 3:02
• The speed of the sound, sorry. – Renee Dec 11 '16 at 3:04
• physicsclassroom.com/class/sound/Lesson-2/The-Speed-of-Sound if you read this, it might make it clear. If it does not, quote the part you do not follow and ask about that. Like Floris, I think I am more confused than you are :) – user108787 Dec 11 '16 at 3:04
• I mean no offence, as this might confuse (both of us :) further, but it might help: physics.stackexchange.com/questions/193609/… and this physics.stackexchange.com/questions/91753/… – user108787 Dec 11 '16 at 3:44