# Standing and Stationary Waves on a String – A Level Physics

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Published on February 9, 2015 by

Waves transfer energy, right? Well they can, but they can also store energy and not go anywhere at all.

Thanks for watching,

Lewis

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• Did you mean the distance between 2 nodes is lambda over 2?

• @Aiknaath Jain You’re right. A common mistake is that people think the distance from node to node is the wavelength when it is half the wavelength.

• But how about the distance between two antinodes? Isn’t that a wavelength?

• @Rinu Pereira Distance between two antinodes is still half wavelength

• Videos are really really good.

• Brilliant Videos

• Great video, really useful!

• Thank you! That was really helpful 🙂

• Great Video !!
Here it is an animation of standing waves

• Shouldn’t the 3rd harmonic be 3/2 Lambda

• +Cardifyz you could rearrange to write it as L= so it’s L=3/2 Lambda , because L contains 1.5 wavelengths

• 1.5 wavelengths in one length
therefore λ = L/ 1.5
therefore λ = L / (3/2)
therefore λ = 2L / 3 remember leave, change, flip

• what are the characteristics of stationary waves ???

• Very very very nice… Thanks you saved me a lot of time!!

• Your videos are good but i think u need to make your videos a bit slower. If u could do your videos in the style of mygcsescience that would be alot better instead of just doing revision videos…

• +Nav Raja I understad what you mean – they can go quite fast especially when there is a lot of new information to take on board and I take my time a bit more with some of my more recent videos. It is worth pausing and rewinding these videos when it does get to a tricky part.

• +A Level Physics Online i REALLY appreciate you replying to my comment. I have a question? If i didnt look at the textbook but watched your videos would that be enough for me to get a good grade in physics? I understand i will have to read from the text book some what…but what if i mostly used my time to revise from your videos

• You’ve got to do both. These videos will help explain the topics but you need to see the information from more than one source, and with worked examples and questions that you set yourself to complete.

• +A Level Physics Online Hi, at 0:56 you say the two progressive waves will have the same phase difference? It was my understanding that the two waves should be in antiphase in order for stationary waves to occur?

• Hi, at 0:56 you say the two progressive waves will have the same phase difference? It was my understanding that the two waves should be in antiphase in order for stationary waves to occur?

• really useful video thanks. Just wondering what is the difference between a stationary wave and a progressive wave in terms of phase difference?

• +Naomi Snow Phase difference can apply to both, do you have an example question where this comes up?

• Your way of explanation is sooo awesome
Seriously
specially in less time , you cover a lot of stuffs
Thanks 🙂

• +Usman Alamgir Thanks

• Thank you so much this helped a lot!

• Thanks so much! I was struggling with this topic.

• At 2:31, did you mean to say ‘node’ instead of ‘antinode,’ as shouldn’t the sentence be “The distance from a node to another node is equal to the wavelength of that wave, over 2” (not “The distance from a node to another antinode is equal to the wavelength of that wave, over 2”)??

• no

• yea he made a mistake there

• You sir are a live saver. Can’t thank you enough.

• hi

• awesoooooommmmmeeeeee

• if the stationary wave doesnt transfer energy then why can you hear sound from a guitar?

• If I’ve understood correctly, at nodes the energy that would be transmitted by a progressive wave is cancelled out by the fact that in a standing wave, destructive interference occurs where the energy transferred is cancelled out and so noise from sound waves is cancelled out. However, at any other point in the wave, constructive interference between the transmitted wave and the reflected wave (which forms the standing wave), occurs, and so the amplitude is actually doubled at these points so at those place in the wave the sound produced is actually louder and it’s at these points where you actually hear the sound, loudest, at the antinodes.

• misunderstoof it g. It holds most of its energy because it is being held at two points, so the wave is not progressing anywhere. But, the particles in the wave are vibrating. This trasnfers vibrations to the air, causing sound

• @tKnz thank you so so so much. I was dying for an answer to my question……

• You are a life saver … Thank you so much … I’m able to understand much better

• What is the pattern between the different harmonic patterns?

• Sir those explanations are really good

• Hi 🙂 Great video.
Quick question: isn’t wavelength supposed to be the distance between 2 consecutive nodes/antinodes? why is it lambda over 2 for the fundamental frequency

• Distance between 2 consecutive nodes or antinodes is HALF OF WAVE LENGTH

• 1:41 can this ever form from EM waves like light waves

• Thank you!
You just saved me from my misconception about it.

• could you go through similarities and differences of progressive and stationary waves? It is on the spec, but I can’t find any information on it online.

• where do you pluck the string to form stationary waves?

• Splendid

• shouldnt the reflected wave cause interference and cancel out the produced wave???

• its in phase, so the interference is constructive

• Thanks again and again

• Dude, just two words… THANK YOU

• No problem!

• @Physics Online I never thought you’d reply but Happy New Year! Thank you very very much for making lives easier for self taught A level students like me. We really appreciate your existence in this world and all your unconditional efforts to make Physics enjoyable and understandable for students around the world! God bless you

• Mate you might just have saved my Physics A-Level

• What does the period of a standing wave exactly mean?

• Thank you

• Does that mean when a stationary wave is created, at the nodes is there deconstructive interference and at antinodes there is constructive interference?

• That’s right

• GCSE and A Level Physics Online thank you!

• At 4:06 you have written 3rd Harmonic as Lambda= 2/3 L. Shouldn’t it be Lambda= 3/2 L for 3rd Harmonic?

• 1/3 L =lambda/2 so from that we can say lambda = 2/3 L

• what is the difference between a maxima and an anti-node?

• Nice animation!