Problem #58 Resonance in Organ Pipes

Problem #58 Resonance in Organ Pipes

[abhisekrout]

Dr Lewin. You are the most intelligent human I have ever seen. I am from India and am preparing for GATE 2020. Thats a test of engineerimg graduates. In the moments I feel low, demotivated I watch your videos. They inspire me a lot. Thank You for Everything. Love You Sir.

[mubashshirahmad]

Amazing experiment sir i have seen 1, 2and 3rd harmonic in mechanical wave experiment with heavy chain 🔗 but listened to it 1st time in my life. Thank sir. 🙏🙏🙏🙏🙏

[michaelmanspeaker]

Nothing like physics to keep your mind well oiled. Thank you Professor Lewin.

[mith_jain_here]

Visualised organ pipes like never before... Thank you hon'ble sir🙏

[daddynikolatesla]

2:45
share this with someone esle and dont say anything and dont show the tiltle😂😂 Great video btw👌👌

[ferozanoor]

Sir u r an inspiration to all, u r an example of how a teacher should be, love from Pakistan.

[DevDungeon]

Absolutely awesome. I know a lot about music theory and how the overtones are generated, but I learned a lot here about how the tube generates it's fundamental frequency when passing air over one end! And it's amazing how just by swirling it faster (passing the air faster?) you get the higher harmonics!

[fusion]

Sir... For the first time i have seen this.... I will try it when i get a pipe by myself... Thank you mich Love you

[unusualwords]

This is so much better than all theory i was reading and couldn't understand a word. Thank you so much.

[Alex-]

To find the fundamental frequency we can use the formula f=V/(2L) since it’s an open/open pipe.

V=the speed of sound which depends on the temperature but I will assume it is 20°C

To find the speed we use the formula:
331+0.6T

331+0.6•20=343m/s

Now we plug this into the original formula:

343/(2•0.76meters)=226Hz approximately.

To find other harmonics we simply multiply the answer by 2 and 3

451Hz

677Hz

[jessesteinbar]

You're the best teacher in the world! And have the most beautiful shirt, really! I would like to own this shirt. Regards from Brazil.

[ashokdaheriya]

Love you sir from India.... I love physics and you inspire me

[tusharagarwal]

Sir, India probably is your largest fan base. We heartly welcomes you here. Considering how love from India for professor is tremendous, I believe you should have tried coming to India frequently. Probably if you would have done so, you can count and miss every single visit here.

[infinitydotcom]

Sir u are best physics teacher of this world

[shubhangsharma_x]

Sir don’t get disappointed by seeing the number of views....these months are very crucial time for jee aspirants...in India...So ....love physics !!love you sir!!!

[glory]

Thank u for another problem to see u again....💙💙💙

[mithilesh]

Witnessing legend getting old 🥺
Thankyou for last 7 years sir

[gioegiogcbr]

Dir Lewin,
I've seen almost all of your videos their are the most knowledgeable and fun way to learn, waiting for new ones.
I'll do anything in order to meet you even for 5 minutes.
Looking forward to meeting you.

[yashvidyasagar]

Sir, I am from India. currently in the final year of my bachelor's degree in Physics.
First, I would mention (as I also have a drop of knowledge from the ocean of music!) that the second note that was generated was not an octave up but was the fifth up note of the first note i.e. the fundamental note.
Coming to the problem, we know that the fundamental freq. (let it be F0) in an Open-Open pipe is given by f0=v/2L where, F0 is the fundamental frequency; v is the velocity of sound in air and L is the length of the pipe used. As you say and I trust you that the length of the pipe is 76cm=0.76m and the velocity is known to us to be 346m/sec. when we substitute these values in the equation of the F0, we get f0=227.63Hz.
And the succeeding harmonics (except 1st Harmonic) will be the integral multiples of F0. i.e. F1=227.63 F2=455.26 and so on. The reason why F0=F1 is because that the pipe is open at both the ends.

[milansunar]

All concepts Clear, Thank You So Much Legend ❤