I was struggling to understand this even after watching a couple of other TH-cam videos. Your video, by far, was the only one that helped me understand this lesson in under 20 mins. Amazing explanation 👏
Very helpful mate thanks. Watched your video on mechanics past paper questions and it was really helpful . Have a test in 2 days on electricity waves and quantum so am binge watching your videos!
A good equation for Stationary waves in one closed end would be: L= 1/4 λ + n (1/2) where n is any positive integer. A good equation for Stationary waves in both open ends would be: L= 1/2 λ + n (1/2) where n is any positive integer. Its not in the textbook I just made it up. It could prove useful for explanation questions.
How does water influence the harmonics heard/why do we need to place it in water? Is it something to do with the vibrations within the water due the denser medium?
excellent question! It simply provides a boundary for the sound waves to reflect from and we can also easily vary the length of the cylinder by filling up the water. Hope this helps : )
Hi Sir, thank you for the amazing video (once again haha). I have one question; the inner tube in the experiment, is it open on both ends? Because otherwise how would the water act as the base if it too was closed on one end?
Cheers mate! Really helpful, have you got a practice question walkthrough video on stationary waves like the one with superposition and Youngs double slit ?
so as you lower it the water level remains the same, so by lower more or less you can effectively vary the height of the tube. The water surface provides a node and somewhere for the waves to reflect off of. Hope this helps!
hello sir, whats the difference between anti-phase and out of phase? can we use them interchangeably? i saw some ocr a markschemes say the word "antiphase" for certain questions whereas i wrote "out of phase by "angle" radians" would i still get the mark or do i need to mention antiphase?
So anti phase means peak to troth,e.g. 180 degrees out of phase, where as out of phase could mean anything but 0 or multiples of 360 degrees. Hope this helps!
It is typically by a mixture of calculation and observation, you might be able to approximate it before you start. If that is not an option you can increase the frequency from 0 at a set length until the first harmonic arises. Hope this helps!
it does but only at certain spots, nodes, at others it does so constructively - antinodes and there are places in between some amplitude in between. Hope this helps!
@@zhelyo_physicswhat I mean is for example at 1:20, why do the peaks and troughs not have complete destructive interference with each other since they're travelling oppositely and with the same amplitude?
ah, I see your question now, this is not a picture of two progressive waves but rather the resultant of all the superpositions. This is best seen animated, check this animation out: www.walter-fendt.de/html5/phen/standingwavereflection_en.htm You can hide the resultant wave and see/pause the formation of the wave after reflection to see how nodes/antinodes are produced. Hope this is helpful!
I dont get the point of the experiment. How am I supposed to vary the frequency when a tuning fork gives off just one? And the length, how can it vary if it is a regular cylinder?
excellent question! The effective length of the cylinder is varied by having two concentric cylinders and the outer cylinder filled with water. By sliding the inner one the water level acts like a "bottom" of the cylinder. To vary the frequency you could either use a frequency generator or a variety of tuning forks. I actually do this experiment in the year in the lab, it's a lot of fun and the students get to measure the speed of sound. : )
yep! Best to practice questions for this: th-cam.com/video/m-GvMCZ3q98/w-d-xo.html and the theory of interference: th-cam.com/video/uCxwsiW7F3s/w-d-xo.html
I was struggling to understand this even after watching a couple of other TH-cam videos. Your video, by far, was the only one that helped me understand this lesson in under 20 mins. Amazing explanation 👏
Wow this is so amazing to hear! Thank you so much for the comment!
This is the most helpful physics video I've watched. Thank you!
You are welcome! Glad it is helpful!
Very helpful mate thanks. Watched your video on mechanics past paper questions and it was really helpful . Have a test in 2 days on electricity waves and quantum so am binge watching your videos!
Glad to hear they are helpful and thanks! If something doesn't make sense, drop a comment. Good luck on the test!
Been going through your videos and I really like how enthusiastic you are throughout the entire video! Thanks a lot!
Fantastic to hear! Thank you for the comment!
Thanks again Sir these are very helpful!!
Glad to hear! Thanks!
A good equation for Stationary waves in one closed end would be: L= 1/4 λ + n (1/2) where n is any positive integer.
A good equation for Stationary waves in both open ends would be: L= 1/2 λ + n (1/2) where n is any positive integer.
Its not in the textbook I just made it up. It could prove useful for explanation questions.
PLS don't die Ur the best😍😍😍😍😍
Thanks for the video. Don’t quite understand why swapping the speakers would swap the maxima and minima because surely the speakers are identical?
Awesome explanation, thank you!
Glad it was helpful!
How does water influence the harmonics heard/why do we need to place it in water? Is it something to do with the vibrations within the water due the denser medium?
excellent question! It simply provides a boundary for the sound waves to reflect from and we can also easily vary the length of the cylinder by filling up the water. Hope this helps : )
@@zhelyo_physics Ohh Thank you
Great video, thanks
Thanks! Glad to hear!
Hi Sir, thank you for the amazing video (once again haha). I have one question; the inner tube in the experiment, is it open on both ends? Because otherwise how would the water act as the base if it too was closed on one end?
Cheers mate! Really helpful, have you got a practice question walkthrough video on stationary waves like the one with superposition and Youngs double slit ?
Thanks a lot! Not yet, but thanks for the idea, I'll get one done 👍
when the tube is lowered into the water is it filled with water or is it empty space?
so as you lower it the water level remains the same, so by lower more or less you can effectively vary the height of the tube. The water surface provides a node and somewhere for the waves to reflect off of. Hope this helps!
hello sir, whats the difference between anti-phase and out of phase? can we use them interchangeably? i saw some ocr a markschemes say the word "antiphase" for certain questions whereas i wrote "out of phase by "angle" radians" would i still get the mark or do i need to mention antiphase?
So anti phase means peak to troth,e.g. 180 degrees out of phase, where as out of phase could mean anything but 0 or multiples of 360 degrees. Hope this helps!
@@zhelyo_physics thank you !
for the second harmonic in open tubes, can we use a length of lambda/2 as well? Because at the open ends, the amplitude will still be maximum no?
Well lamda/2 is the smallest length of the tube that will produce a harmonic, i.e. the fundamental, so it only works for that : ) Good question!
@@zhelyo_physics oh right
thank you!
During the experiment , how do you know that the cylinder in the water is now at 1st harmonic , is it just by observing or ...
It is typically by a mixture of calculation and observation, you might be able to approximate it before you start. If that is not an option you can increase the frequency from 0 at a set length until the first harmonic arises. Hope this helps!
Do you have any videos on mechanical properties of materials ?
th-cam.com/video/rNN2qvcvH_A/w-d-xo.html I do!
@@zhelyo_physics life saver ,thank you Soo much
Why does the original wave not destructively interfere with the reflected wave?
it does but only at certain spots, nodes, at others it does so constructively - antinodes and there are places in between some amplitude in between. Hope this helps!
@@zhelyo_physicswhat I mean is for example at 1:20, why do the peaks and troughs not have complete destructive interference with each other since they're travelling oppositely and with the same amplitude?
ah, I see your question now, this is not a picture of two progressive waves but rather the resultant of all the superpositions. This is best seen animated, check this animation out: www.walter-fendt.de/html5/phen/standingwavereflection_en.htm You can hide the resultant wave and see/pause the formation of the wave after reflection to see how nodes/antinodes are produced. Hope this is helpful!
@@zhelyo_physics animation was perfect thank you
great video
Thanks a lot!
i love you
are these applicable for A'level caie physics?
yep!
R we supposed to memorise the harmonics in one and closed tube
I recommend being able to derive them quickly rather than purely memorising.
I dont get the point of the experiment. How am I supposed to vary the frequency when a tuning fork gives off just one? And the length, how can it vary if it is a regular cylinder?
excellent question! The effective length of the cylinder is varied by having two concentric cylinders and the outer cylinder filled with water. By sliding the inner one the water level acts like a "bottom" of the cylinder.
To vary the frequency you could either use a frequency generator or a variety of tuning forks.
I actually do this experiment in the year in the lab, it's a lot of fun and the students get to measure the speed of sound. : )
@@zhelyo_physics oh now it makes sense, thank you!
Thank you
anytime!
Do you have a video for the Young's Double slit experiment?
yep! Best to practice questions for this: th-cam.com/video/m-GvMCZ3q98/w-d-xo.html and the theory of interference: th-cam.com/video/uCxwsiW7F3s/w-d-xo.html
can you just say that particles between antinodes are in antiphase?
you could say that particles on either side of a node are in antiphase.
thank you so much for the vedio ......but the adverts are just too much
Anytime, sorry to hear this pal. Maybe I could try to rearrange them.
20 minutes w ads