# Resonance- sound

Can someone please explain resonance to me? I thought it was when an external object has the same frequency as an object, so through constructive interference, the amplitude is intensified. And maybe this has something to do with standing waves, I don't know. But can someone please further explain this? Thanks.

• Hi Renee If you read this first, and then come back with any points you don' t follow, that might help you ( I hope its at the right level for you) physicsclassroom.com/class/sound/Lesson-5/Resonance
– user108787
Commented Dec 11, 2016 at 4:47
• Okay, I think I understand this in terms of a tuning fork: you force one into vibration, causing the other to vibrate also without having to hit it. Can you explain how resonance plays a role in the example of pushing a swing, or the collapse of the tacoma bridge if soldiers don't break their step? I think I understand resonance in terms of its definition, I am still just a little fuzzy on how to apply it. Thanks! Commented Dec 11, 2016 at 18:30
• The Tacoma bridge collapse is always thought of being due to resonance, I used to quote that myself, but it was something else (that I hope you don't need to worry about) called aeroelastic flutter that is now thought to have caused it to fall. en.wikipedia.org/wiki/Tacoma_Narrows_Bridge_(1940) I will do an answer , or a comment re resonance in a few minutes
– user108787
Commented Dec 11, 2016 at 19:46
• links re resonance, will you see is this a duplicate of what you want to know, but I have no problem writing an answer. John Rennie in his answer covers the swing part, I think: physics.stackexchange.com/questions/90497/…. The other example is the soprano breaking the glass with the pitch (that is the frequency) of her voice, I always wanted to know if that is true.
– user108787
Commented Dec 11, 2016 at 19:54
• Just wanted to say thanks for all the help! I aced my test yesterday :) Commented Dec 15, 2016 at 2:22