Waves, Light and Sound - Physics 101 / AP Physics 1 Review with Dianna Cowern

[@brantonhill9614]

I am 56 and dropped out of high school. I was in remedial math. Mrs Cowern taught this lesson in a way I understood. I am a truck driver waiting to pick up a load, and I was almost able to finish copying the lesson. I’ve never had algebra. I have, tho, understood Einstein’s train and bouncing ball, that his first theory,(general relativity?) is a heuristic, and some other things. I’m fascinated by stuff, and I’m very grateful and motivated by this teaching. I plan to finish the lesson and try a problem. Thanks again

[@jerrybyers2172]

Good for you! Keep on learning! The knowledge is more rewarding than any diploma!

[@claudedykstra]

No body asked

[@julesl6910]

Body don't asked

[@anleilei6626]

​@@claudedykstra just like your unnecessary comment

[@math_the_why_behind]

I love how you have visuals at the beginning of each video; it really makes me curious and even more excited to watch the video :)

[@md.nurealam6548]

Brain with beauty does exist! I study chemistry as a graduate student, I wish I can became a college student again and start study physics with this lady!

[@physics77guy]

in my physics bachelor program we only had 2 girls in the whole program....lol

[@ivoryas1696]

This is honestly my favorite physics tutorial playlist on KZbin. (Sorry Dave!) I just... _vibe_ with it's pacing, questions, and thoroughness! Even if you never make another one of these again, though, I'mma pray for your recovery! ✊🏾

[@quark9574]

Your videos are really helping us students who gets confused in everything . Thanks a lot

[@MmmmmBacon8r]

I’m 41 and am a college drop out. Watching your videos on physics, sound waves, longitudinal waves, etc, fascinates me and makes me excited about learning it. It makes me “hungry” to learn more and want to learn more. It may take me a bit longer to learn that what’s possible in a classroom because they’re kind of pressed for time, but I’d love to learn more and see how much my brain can handle lol. I’ve never felt this way about learning something as high as physics and I love it. Science was/is my favorite subject in high school and watching these has given me the desire to learn more about this. Maybe even go back to college for a physics degree (if possible). Thank you so much for this! You’ll always have me as a subscriber!

[@mayurvalvi13]

I'm very impressed with you hand writing 👏

[@johnrasmussen3752]

me too ... I kept imagining how many takes I would have had to do.

[@Canal13hifi]

I'm a Dental Surgeon, and your videos still help me understanding some things in my field (Dentistry, Physics and Mechanics are closely linked to one another) !! Thank you !!

[@PeterBeckleyArt]

Diana and Destin both helping me get smarter every day. Thanks!

[@Steelwolf171]

Had a good laugh at "Take-a-waves". When I was studying physics in university waves were always my favourite. Thanks for another great lesson!

[@SkyhawkSteve]

I understand that explaining waves as changes in the medium makes a lot of sense. I'm not sure that the viewer will understand that electromagnetic waves don't use a medium. Considering how long it took to figure this out... well, maybe it's not the highest priority for the lesson. As an electrical engineer, I still marvel at the weirdness of EM waves traveling like this.

[@mattp422]

Diana, everyone always comments on what a great teacher you are, and that’s very true. But I wanted to say you have awesome penmanship!

[@vanshagg2003]

*This video is very beneficial for 10th Grade students of India....* 😊😊

[@zeroweight8932]

If you can understand..... Everything is useful.

[@localtitans4166]

Haa Bhai

[@nailsonseat]

Humble brag

[@SubhashSingh-vl3rr]

Righttty

[@drstronk]

Right bro

[@iprovedthem5527]

I'm a 39-year-old Foundation Engineering student and this video has saved me. Could not get my head around waves and it's finally starting to make sense... plus your handwriting is much easier to read than either of my Physics lecturers.

[@mennodegroot1109]

Fantastic episode, Diana! I know most of what you taught, but it just blows my mind just how wonderful God has created all this for us to discover! I'm sure Destin would agree, and I'm looking forward to much more here on your channel!😊

[@sagittariusa2008]

I agree; Thank-you Zeus!

[@analogopithecus9630]

Which god was that?

[@dharmeegajara440]

the best part was the perfect analogy made in the beginning only which gave a whole new perspective woah

[@charles_wipman]

Good lesson, my 1st ten in a exam was with the light refraction at 3rd grade; and my favourite radio station it's the WFMU.org 91.1 and 91.9 fm in New Jersey and New York City, and at 90.1 and 91.9 fm in the Hudson Valley.

[@jonakers704]

Fun fact: Ham radio operators use a shorthand method for determining broadcast bands: Take the frequency you are using, for instance the 93.5x10^6Hz, but represent that in MhZ. Divide 300 by that number, such that 300/93.5 =~ 3, and that is the general broadcast band you are in: the 3m band. It is a very general equation, but it comes in handy for determining what band you are in with simple in-the-head arithmetic. Where is the frequency range for the 10m band? Oh, around 30MHz (Ham radio operators use around the 28MHz range, but this is really close)

[@petejohnston5880]

OOpps. breathing helium doesn't change the frequency but changes the formant. The frequency is determined by the tightness of the vocal cords and the force of the lungs, and that remains almost the same. What changes is the speed of the sound bouncing around the mouth and nasal cavity which form the spectral filters, like the sound of which vowel we hear. The frequency of the filters do go up in pitch meaning that the harmonic envelope rises in pitch but the fundamental frequency it self doesn"t change. So it's like your mouth and nose and in fact your whole head has shrunk but the vocal cords haven't. Try a pitch detector on your vocal range with helium and without and you'll find it is the same.

[@randompatillo4336]

Hey, keep up the great work. You do an excellent job of describing all sorts of physics. I'm glad you are out there, someone for kids to look up to and see making science fun! Even as someone who studied physics and engineering for years, each of your videos is fascinating, and worth watching. It's been a great way to shine some rusty Newtonian skills!

[@ZerobugCoder]

IITans were here.. Love ur work. All these topics are nostalgic😊

[@akshinbarathi8914]

yeah v old memroies

[@martf4701]

15:50 so this means that if you speak at one end of the slinky and someone else listens at the other end, the more streched the slinky is, the higher the voice will sound?.. Or.. The faster the sound will reach the other end?..

[@pierreabbat6157]

The magnitude and direction of the energy flow of a light wave is called the Poynting vector. Sounds redundant.

[@FlyingSavannahs]

Tattoo artists set their needle guns to the highest hurts they can.

[@sooryasijin3343]

She makes everything more loveable!!! 😁.... Thank you

[@Zehn2222]

because she is ♥

[@calholli]

My algebra teacher was like her when I was young. This is probably one of the main reasons why I like math so much, because other people that like math are so awesome.

[@danagillam]

If you watch the entire video by Mark Rober, you will realize that the change in pitch is not a result of the change in the speed of sound in the different mediums. In order to change the frequency you must change the vibration of the source. When you hear a sound traveling through water or through air the pitch does not change, the medium does not affect the frequency, only the speed and wavelength. The heavier particles of the gasses cause the vocal cords to have less acceleration and thus lower frequency. Your success as an educator depends impart on your credibility, which took a hit in this video.

[@michaelcornish2299]

Thankyou, this is a lovely video. By chance I have recently started teaching waves at school so I will be sharing this with my colleagues and students working from home. I have also recently seen a video of one of the other physics teacher's doing your 20 experiments with her kids!

[@megamanx466]

Indeed. I'd advise to let your kids know that probably most of the technology they encounter in the future and now will/do use some type of wave form... most likely as electricity or radio! 😅

[@RobertSmith-pw9io]

Excellent once again Professor !! The energy you impart to your teaching is very reminicent of Professor Julius Sumner Miller, only you are even more energetic !!! WOW !!!

[@deleted7446]

People like you makes world a better place .

[@catherinemalcolm8125]

I have just realised, having watched this mind-blowing video, that our natural state could be described as children! So that anything that disturbs this state can be either an excitement or a stresser.

[@alanmcdougal]

Thanks Dianna. Your teaching of physics is paramount knowledge that you share with us and I love the way you explain it. Thank you again.

[@SteveJubs]

I desperately need the bit at 2:13 to be isolated out of context. “This ...” *chucks a slinky off the table* “... is not a wave.”

[@Mksharma724]

As a learner I think your understanding skill is very impressive.

[@robinperkins7623]

Hey Diana Thanks for doing what you do... These videos have helped me a lot :)

[@bernhardsagat77]

Really really good explanation. Don't be afraid to add more formulas

[@sanjuansteve]

@13:50 I'd say yes, it is possible to hear earthquakes in the air. If the ground is moving and vibrating, it is moving the air like a giant speaker. We may not be able to hear anything, but I'd say it definitely makes sound (compression) waves in air.

[@interested3791]

HOLY SH*T!! I was literally looking for a music to listen to while doing my Physics homework that, get this, is about waves

[@jamit2u]

Don’t swear in Miss Diana’s class that very rude

[@interested3791]

@@jamit2u i kinda censored but sry anyways

[@chrispeoples4606]

From a seismology approach, longitudinal (P waves) and transverse (S waves) waves are considered body waves in that they both travel through a medium. It should be noted that transverse waves can only travel though solid materials because fluids by definition do not have a shear modulus. Surface waves are those that travel along the flexible boundary between two media. Surface waves on the ocean surface are Rayleigh waves, which also travel on land when produced by earthquakes and cause the major damage.

[@KevynTD]

Congratulations on your work, it was sensational!! I really like your videos and curiosities that you bring!!

[@guyh3403]

9:50 Lol, I just HAD to pause ;) Thanks for explaining all this interesting stuff!

[@bobandres5559]

I was totally into this video, except you didn't use a steel slinky. Thank you Diana your presentation is excellent, wish i had teachers like you growing up.

[@steve-o6413]

I always watch other people's thoughts about Frequency, Vibration and Energy and listen to their analogies on the subject. Coming from your moving mud puddle video in which I found very interesting...

[@powerprofile69]

I am your squad from India...recently addicted to your explanations🔥❤

[@akaisekai143]

I am happy you are continuing this series 🤩

[@somnathganguli3973]

You definitely have a fun and interesting way of explaining physics . I have been following you for some time. Great. Keep it up. I am a medical doctor and physics, astrophysics is an interest I follow. Really enjoy your "presentation" at the end of the day after my professional responsibilities. Thanks. Sometimes I wish I was back in school with physics and mathematics.

[@harishvenkat1313]

can u explain about dark and bright fringe , I want to know more deeper about them ,super excited

[@ansitapradhan7794]

Problem 1: First case→ v=0.25m/s Secondcase→Wavelength=0.1m. Problem 2: Wavelength=0.32*10^3m. Problem 3: time(light)-time(sound)= -28.4 seconds.

[@deleted7446]

Good teacher makes good students . Good students can change the world.

[@PapaFlammy69]

okay

[@sarthakjain1824]

Hey

[@David_Hardy]

i think he got lost. Flammy, this isn't Andrew's channel.

[@nycholasgr8112]

okay

[@Channel-dp3wc]

Papa 👴

[@rohanakrishna7582]

lmao

[@timauth]

I can't believe you've never seen a rocket launch. Everyone should see one in person at least once. Of course some are better than others and they get scrubbed so often that I feel very lucky when I get to witness a good one.

[@FlyingSavannahs]

I got to see the Chandra X-ray telescope go up. First Shuttle mission commanded by a woman, Cmdr Eileen Collins. Two scrubs the previous two nights with hydrogen alarms in the the Shuttle Main Engine area at < T-10s. Yikes! Third night with same alarm shortly after liftoff. Abort was a moot point as the Return to Launch Site scenario was never considered survivable. Loss of one SME before main engine cutoff resulted in Chandra's initial drop off orbit being too low. It took longer to get it into it's design orbit. A real nail bighter. I was on the outside stairs of the Launch Control Center in front of the VAB. Even here your body and chest resonate from the sound intensity and your clothes just shake against you. Quite an experience. This was well before 9/11 so I'm sure the stairway no longer allows viewers to stand right along the wall of the LCC nerve center.

[@NeroDefogger]

amazing, that solved some questions I had, but now I need to research a bit more about light...

[@coachcape]

I'm not even in schoo no more and I be learning physics let's goooo

[@nainagupta2658]

Watching your videos from India 🇮🇳🇮🇳 very helpful Thankyou 🤗🤗

[@alonegamerz7783]

It helps me in my exam of 9 th grade thank-you

[@rnklv8281]

Interesting when you said: "all sorts of cool things happen when waves travel thru matter/medium". An example (sound waves in water) may be when a scuba diver breathing underwater will experience a noticeably louder breathing sound when inhaling and exhaling via the regulator mouthpiece (with hose connected to the air tank), and ambient noises underwater appear be non-directional (experience relative to the diver). When you're tuning your radio to your favorite radio station at 93.5 MHz, I'm assuming your tuning to a modulated carrier frequency wave. The music/information wave (the audio portion you want to listen to is a separate wave) is superimposed to a carrier wave (its purpose is to "carry" or reach your radio) and then the new modulated carrier wave (carrier wave + music/info wave) is transmitted and picked by your antenna/radio receiver. The circuit in your radio receiver can filter out the carrier wave and take the energy from the music/information wave and modulate into audible music. Trying to remember what I was taught, so I might not be right on the technical procedure and terms. I still have a low-tech AM (Amplitude Modulation) transistor radio. Does not require a huge antenna. If I pop the case open, the antenna is just a small magnet/metal bar with a lot of wire windings around it (inductive coupling concept?). It does have its limits in terms of tuning, both selectivity and sensitivity, but in a worst-case scenario (which I hope never happens) and much of our "higher tech" communication systems goes down, it (transistor radio) might come in handy.

[@almosh3271]

This is a great lesson Dian. Keep up the good work!

[@karnampathak7855]

Your video help me in clear visualization of physics and till before i think that i understand physics but now i feel the physics

[@snapdougles]

3:19 "Wave: A disturbance, or displacement, of some medium that carries energy." What's the medium that carries photons/em waves in a vacuum? I feel like I should know this, I studied advanced higher physics in high school, but I'm drawing blanks here. Is it to do with wave particle duality?

[@laurendoe168]

It's called "aether" - I'm kidding, but that's what many believed a century ago.

[@snapdougles]

Ahhhh so I've realised what it is now, the medium is electric and magnetic fields. EM waves, of course ahaha

[@In.Darkness]

Very cool. Cheers to your health from Canada Physics Girl

[@MH-ms1dg]

imagine "the wave" being explained through a combo of physics, biology, sociology, and psychology

[@JjVa20]

I don't even study anymore but I love watching these videos because I love physics

[@epicasteroid6873]

Why doesn't my physics lecturer teach me this way ?? 😩 I started to love physics only after watching yt channels like this one,before that it was a nightmare for me I really like these videos Thank you Dianna 😊

[@arstudios6883]

Mam what happens in longitudinal wave collision still do they superimpose and can pass through each other

[@johncourt9580]

Hi Dianna, another great video, presented in your captivating style, makes a great way to learn about this fascinating world!

[@techhelp1941]

The only difference is the way of our perception for the same thing.....Nicely done Diana.

[@NewMessage]

Slinkies... the science demonstrators best friend.

[@TheReaverOfDarkness]

Could you make a video explaining why heated water starts making noise quite a while before it starts boiling, and actually stops making the noise right before the boiling begins?

[@nichudi]

Love your videos, and, you as an amazing human. Keep it up! This world is going to need the amazing humans you are inspiring.

[@dmwalker3009]

Great video, I use many of yours in the Physics classes I teach. But you really should include a warning that breathing He or SF6 is not a smart thing to do. I know the demos carefully limit the gas to the vocal chord region, but he did mention "filling his lungs". Not a smart or safe thing to do. BTW I'm MIT '76 BSEE. I recognize your teaching style and formalism.

[@eitanavisar52]

Amazing video... The explanation is so good! Thank you very much 💕

[@timeverse1545]

Dianna is catching waves with a freeze-bee 😂😂😂 .. good luck with that

[@emmanuelmaximus2174]

At 17:20, it is mentioned that velocity= distance / time it should be velocity= displacement/time

[@Luxcium]

I am from another country with a different system of education and it's exactly what I learned... We must go to college for 2 years, before we go to university, which I didn't complete so when I went to university they gave me those classes Physics 1 (Mechanics) Physics 2 (Electricity and magnetism) Physics 3 (Waves, Optic and modern physics)... (Québec Province, Canada)

[@IrocZIV]

93.5 WHMI in Michigan is a pretty good station too

[@saadkarim3516]

Hey diana ,. Love your way of teaching ,. Its been really beneficial ,. I just wanted to suggest if use an Ipad ,. For the writing stuff, wont it be more exciting ??. Look up the channel "" crash up "" for reference... It would really elevate your channel...

[@kunalmehra5217]

Very cool !! It was very confusing. You explained very well with problems and visuals💕 Waiting for next lecture😉

[@ditscogaming775]

ur vids really help me physics mam/girl thx for such great content

[@hanoroam2259]

We need more of this

[@sahitya6424]

Your handwriting is better than me expect everything

[@dinesh9596]

Cannot be more thankful for your wonderful videos 😊

[@Coreify]

I enjoy watching all these physics videos!! I just find there isn’t enough questions at the end. May you please add like a worksheet we can complete or something with more questions :) keep up the good videos

[@michaelsommers2356]

There are numerous books filled to the gunwales with physics problems. You can also find problems online.

[@-sciencenote2517]

Hello Diana, I am an electrical engineer from Morocco. I love your work. there is any way to get in touch with you privately ?????

[@ishraqal-yahyai6834]

Thank you you make every thing easier .

[@quasarstarpower2858]

It's awesome! Thank you Diana:)

[@GauravThakur-hg3ic]

YOU ARE A GREAT TEACHER SIS!

[@shivamsharma-iz5yv]

can you please explain , are these waves probabilities or are they the path or are they the path of medium in space

[@louiscorprew7970]

This is an awesome video, thank you!! I look forward to seeing more on this subject 🙂

[@Yznewday777]

Great content thank you . I will i would of majored in physics back in 85. But no I enjoy so much your teaching thank you .

[@jeankellner2071]

3:39 That jelly earth made me uncomfortable somehow. But great video as always. 👍

[@jamielondon6436]

I was trying to drink some water at 9:10, and now my floor is wet … so, thanks for that (and for the extremely well presented knowledge, of course)! :-)

[@vaedkamat484]

I'm pretty sure EM force is the cause of the slinky's wave. It's honestly amazing all of our classical mechanics and kinematics depend on the electromagnetic force. Without that, you may not even me able to exert a force on another object and the reason why the mechanical energy of a spring itself exists. Physics is amazing!!!!!!!!!!

[@amaanakhtar7735]

Why do we say light has speed 3 × 10⁸ m/s but the truth is we don't know it ?.

[@thedecktothe16thpower56]

She could put a space suit on go out into a vacuum and create some serious waves. Not only that, she could use the waves to control her axis orientation. Clever yet she could move her hands up and down like a piston still sending waves back and forth and shuffle to the side and become the wave if she throws in a spin. If she extends them and retracts them, whilst going up and down like a piston in opposing motion she'll be able to flip over the waves. This alone could actually help a person in a space suit, with out wasting gas or space in the suit. When you push it off the table its actually a wave, I think. In this case you accessed gravitational potential through gravity. I think this is a MAJOR over sight in the physics Departments. That leads to confusion about gravity space and energy. Its like punching space time in the face and not expecting to get hit back harder and crushing the data into little bits(bytes), what ever your flavor of burn is. There's a difference between respect of power and straight up denial. This is no pun of her and I realize observations take time. She gets it, it's all in her symbol and her natural being. I think when we make sound all we are doing is allowing the Earth and other vibrations to provide a key hole for the Earth to scream through. The bigger the cavity the louder you can hear the shear tension deep from with in. A sonic boom so loud and powerful it just downs in its own vibrations. If we heard Earth all at once it would destroy us as a human like a bioluminesent kernel popping. In a way we do already but the process is slowed down. Don't mind me. I'm just at man of the moon thats orbiting you. kzbin.info/www/bejne/qYSTqox6mc9snLc

[@junak777]

I still can't get longitudinal cyllinder waves of the vacuum. Seems not so complex neither complicated. Solution to me is using rod and arc(H) as abstracts or manifestations of invisi-necklace of bub-ble(s), ouroboros helical dna- like uraeus energy flow, and ideas like rings spheres waves cyllinders( Viviani curve) to explain scalars(spheres balls) and magnetism kinetics. And about refractive losing speed force by bending like in case of gravity of 5th postulate in space XP: blue sky cuts off white light so how than paper is white and cameras blue or how eyes uses interference or resonance to see? Something is subtracted but also summed up. Like 1 in 1 out, russian doll. Ok. Thanks! I love enthusiasm your high pitched tone spreads. Keep it going! Happy New year!

[@BillMSmith]

Waves are amazing. But now I want to see a stadium of people doing a longitudinal wave. MIT, I'm looking at you!

[@FlyingSavannahs]

It's a moot point. Caltech is already doing wave-particle duality in the Rose Bowl.

[@fredricprabu7815]

Oh that's awesome . This video is amazing. Oh Jeez your explanation is excellent 👍 .

[@krioshhh7384]

nice explanation of Doppler effect, ty♥

[@MuhammadDaudkhanTV100]

So super hit and cool content bro

[@nitigyasingh7211]

Indian students gonna love her videos....especially those who are preparing for JEE and NEET

[@mrhphysics7848]

Huge fan of your work, thank u for making these.. CB unfortunately recently dropped this unit from P1 :-/

[@NoActuallyGo-KCUF-Yourself]

Great review! Is there going to be one on electricity and magnetism? That was always my weak area in physics.