Stationary Waves & Phase - A-level Physics
Vložit
- čas přidán 6. 08. 2024
- scienceshorts.net NOTE: it's superposition, not superimpose!
Please don't forget to leave a like if you found this helpful!
-----------------------------------------------------
00:00 Phase & radians
05:00 Constructive & destructive interference
09:13 First harmonic (fundamental) - nodes & antinodes
10:38 Higher harmonics
13:21 Pipes -
----------------------------------------------------------------------
I don't charge anyone to watch my videos, so please donate if you can to keep me going! bit.ly/scienceshortsdonate
I've never understood how you work out phase difference and the phase between 2 points on a wave, nobody has EVER described it as imagining the wave as a circle, that really helped, thanks!
Thanks, Random Person!
FRR
What curriculum do you study? This is how it is literally explained. It is NECESSARY for the student to learn this concept. especially in SHM.
This man is carrying me through a level physics, much love🙌🙌
Volte same here
same ✋🙂
Same🤝
1st term into A levels and I’m dependent on CZcams videos.
i have my paper 1 exam tomorrow, and same
Your voice is ridiculously similar to the narrator from the Headspace app. Uncanny!
i think this but for exurb1a
for those who have not read the description
IT IS SUPERPOSITION NOT SUPERIMPOSE!!!
Thank you ! I like your videos first then I watch them. Because I already know they are helpful and awesome !
Great video, especially the last bit on open/closed tubes and stuff, thanks
How have I not found these videos faster! These are beautifully presented. Thanks
honestly a lifesaver periodt. i hope u have a great life
Dude you're back just hurt from carrying us all through a level physics. Seriously can't thank you enough
Thank you for your videos, my teacher is just not eloquent enough to explain even the most simplest thing, at times. Keep up the good work!
You're honestly a lifesaver sir!! I am writing my (cie) A levels, both AS and A2, this Oct/Nov (6 months earlier than my classmates). Your videos have been immensely helpful for me understand the Physics topics especially since your explanation is in depth. Studying by myself is just so difficult, having someone to explain makes it much easier. So thank you very much for posting these videos!
how did it go? omg
did u manage it by yourself?
Please add the topic of measuring speed and wavelenghts of sound using stationary waves. The one in which air column is increased and two lengths are noted.
ultra HELPFULL.:)
i always come here for revising certain A level topics
Excellent video.....so clear to understand.
Sir,thanks for ur grate videos,they really helped me with my physics!
Thank you sir!This helps me so much with my NCEA level 3 exam. I am in New Zealand.
Sir I am really pleased by your explanation. Thank u very much.
organ pipes, doppler effect, and understanding progressive and stationary waves are the most hard topics I till date experienced in physics(I am 13 years old) but the video gave clarity on the concepts
18 yrs here still struggling
A great introduction to stationary waves ..Thank you so much
You can just write it as a ratio of wavelength to radians where *λ:2π* so half the wavelength, you get *π* .
Thank you sir for such brilliant videos.
Woow. This cleared all my double about standing wave and phase. ❤. Thank You
Sir i would just say your videos are just amazing, i am so unlucky why haven't i found it earlier
consider yourself lucky you found him now :)
@@justaracoonchillinginatoilet69 bro this comment is 5 years old
Such a great video! Thanks!!!
Lovely explanation. Love from an A-levels student Pakistan!
This was very useful! Thank you so much sir.
This is a wonderful explanation, Thank you so much sir.
You have provided really good content within so short period.. Great!! And thank you!!
Thank you for helping me with leaving cert physics!
Very helpful, thanks!
Your videos helped me so much
This guy could commentate for a professional game of pool and no one would notice lmao
thank you for this video
Thank you so much for the help. I'd been looking for videos like this to help with my studies in physics. Though I do have a question: Could you add end-correction to the lesson? At the part of closed and open pipes.
what does that mean?
Definitely subscribing
Can there be antinodes in the bottom side of the string (reflected wave antinodes)? Because you only marked the antinodes that were on top of the string, not the ones at the bottom
Why does there have to be an antinode at the open end? Can't there be a node aswell sometimes but the standing wave continues because it's open ended?
great great video!
Super helpful sir thank you ❤
at around 7:00 why do the waves reinforce, instead of cancelling out?
sorry, you answered it.
好棒！great！
Sir plz make a video on doppler's effect
thankyou!
what's the difference between max displacement and max amplitude?
thank you so much your voice is so euphonious
I totally know what that means...
@@ScienceShorts
eu = good
Phon = sound
Ious = adjective ending
Your voice sounds good.
@@azuregriffin1116 Joke dude.
@@ScienceShorts fair enough.
I always felt so dumb for being baffled by the concept of phase difference and fundamental frequency, i never thought i would understand it so clearly, thanks ❤
watching these at x2 speed for tomorrows exam
Idk why is it hard for me to understand waves 🤦🏻♂️
Frr
@@fatimasaid648 xD
same
God bless you Sir, I didn't understand some concepts until I watched your video.
Rehnuma Sarker paper 2 final tomorrow?
@@g-shockforlife1703 I had Unit 2 a few days ago
Rehnuma Sarker mine is tomorrow!!!
@@g-shockforlife1703 Good luck
Rehnuma Sarker how was your exam
Summarised a fifty minute lesson in five, I think that's perfect
Great video. The explanations are so easy to understand.
Great!
thanks man i love u
Sir I believe that stationary waves are interfered and superposed
lol, I was just scrolling down to write the exact same thing. Some of my friends lost marks saying 'superimpose' instead of 'Superpose'.
Yes, you are right - for some reason the boards don't like the word superimpose, which is daft in my opinion. The words you give are what they prefer.
Was thinking the same thing we were told not to use superimpose
thanks for the info :D
you made it sooo easy thanks man
or rather should i say Sir
At 13:17 , for the equation, can u say n is ghe number of antinodes?
coherent
this was very helpfull thank you sir
thank you )
I can't understand the standing waves still and it's driving me nuts! On the drawing at 7:50 wouldn't there be no movement at all because they are 180° out of phase?
So helpful, thank you!
Oh my gawd you helped me alot
Can you do a video about end corrections please and thanks
Hey could you make a video on upthrust and archimedes' principle please?
Thanks
do u have anymore explanations for the equation f =1/2L √T/µ , because I dont get what the equation tells us and how it came up or why it's called 'fundamental mode...'. Please answer if possible.
its the frequency at which the first harmonic is formed
and if it is second harmonic then the one changes to a 2 and if third then it changes to a 3 and vice versa
Thanks.
Does pulling a string from both ends is a stationary wave?
To be frank, my teacher does a good job of explaining this. Everything he had previously mentioned had been mentioned in this video. I use these to remind myself :)
is destructive interference not when two wave with crest and the trough meet?
because according to the diagram u have drawn at around 8 mins is it not a destructive wave?
What exact time are you talking about i may be able to explain
I think that may only occur when its an open end becuase the wave isn't bouncing back, ill check
+Science Shorts I don't understand how there can be both constructive and destructive interference at an antinode... Surely the destructive interference would just cancel out and create another node?
Cleo Morris there isnt both constructive and destructive at the same moment.
that is true. A destructive interference causes a node. Constructive causes an antinode
Also could you cover phase differences but on stationary waves?
If they're within the same loop they have 0 phase difference and if they are in adjacent loops it will have 180 phase difference, if for example it was in loop 1 and loop 3 it would be 0 phase difference
@@brycefernandes7167 so regardless of the position 2 points on the same loop, they will be in phase? Thank you
@@khabanh6928 yea exactly
would it be ok to use these videos if you are doing OCR exam board
Yes, as long as you look at your exam boards specification - double check what information you need to know and that way, you don't learn useless stuff; I do Edexcel and it works for me :)
Sorry I dont understand what the 'd' you are referring to at 4:55 relates to?
distance from peak to peak or trough to trough
What actually is natural frequency. You missed resonance part.
how to use oscilliscope
What if the waves are at angles or perpendicular to one another can they still superimpose
I'd assume so, there just wouldn't be a simple way to find out the resultant wave.
so will it not be a straight line
As our a level physics taster we did the antinodes on a string practical. Almost like they don't want people to do physics ):
Hey I don't understand what the dotted line is for. Isnt it only one wave that is formed?
naheemah akinwale the wave oscillates. That’s showing the peak as it moves up and down. It’s stationary doesn’t mean it stays still.
Hello just a quick question I got in an exam and didn’t really know what to put, hopefully you can help 😁 I was just wondering why the thickness of a string on a guitar means that the pitch is lower when plucked?
Cuz mu is bigger (heavier string), meaning that the 1st harmonic is at a lower frequency.
Science Shorts thank you 😁
If the waves cancel out, how is it that the strings vibrate for a while on a guitar?
When did he say the waves cancel out
Big up Arthurs class
At 7:18 by "conditions" is he referring to the phase difference ? ( as in the case should be in phase)
By conditions he means like external forces, so if something is acting about one wave it has to do it on the other two, the waves there to be the exact same just going in opposite direction
Hi, I don’t understand why there’s a dotted and solid line to represent stationary wave
To show the two 'extremes' of the wave as it goes up and down
Look out, Professor Duncan, your old friend Jeff is going to ask your for the answers to every quiz and test so he can cruise through Greendale
Just by asking that, he has insulted the integrity of this entire institution.
nice
So are you allowed to say that the two waves SUPERPOSE in an exam question??
The exam boards don't like superimpose, but rather interfere or superpose, even though they are effectively the same word.
@Finn Laffey Student They really are, regardless of how academics appropriate them - 'pose' means 'position'.
king
thanks a lot for your video, but I had a question.AT the start of the video, you said that a wave can be thought of a circle, which it stars from a point and ends at the starting point, and a full circle is 2pi radians and half of a circle is like 1 pi radian but for the sine graph , it goes back to its original position at half of the period which is 1 pi in circle graph , so i think for circle graph it should be 2 circles instead of asingle circle.
while you aren't wrong about the fact it goes to its original displacement after 1 radian, the definition of 1 oscillation is going from the "maximum positive point" or the positive amplitude, then going to the "maximum negative point" or the negative amplitude and returning to the equilibrium position. a particle has to go to these 2 extreme points once for it to be considered 1 amplitude. That is why 1 wavelength looks the way it does (1 positive hump then 1 negative hump).
What does superimpose mean
You have literally saved me from failing A level physics. Amazing video
Same bro
Yep
I’m confused as to why all points between adjacent nodes are in phase? Saw it on an AQA question
Because they all reach equilibrium, and their individual amplitudes at the same time. Therefore they have to be in phase.
@@ScienceShorts how do they reach their individual amplitudes at the same time?
At 6:00 why do the waves not cancel each other out as a peak is meeting a trough? (Also your videos are so helpful they have hopefully saved my physics a level on Monday!!)
Yeah that'd normally happen (in diffraction grating etc) if the waves weren't confined to two points like they are in a standing wave.
ah fab, thanks!
8:09 how it is node with 0 amplitude?! It has a reflection point.... U mean all points on the horizontal are node with 0 amplitude right? I hope if u r wrong to make a note on the video cz it was a bit confusing....Thanks a lot in advance :) :D
the video is correct
The reflected wave cancels out the first wave and thus creates that point to have an amplitude of 0. In other points the two points will add together and create different amplitudes
Doesn't phase start at 3 o'clock, not 12 0'clock?
It's all relative, so it doesn't matter. From 3 o clock is a very maths way of doing things, like bearings. I've never liked that.
Could you explain why a full circle is 2 pi radions?
Why 360 degrees? It's just a number that we choose, because it's easily divisible (much like hours in a day, minutes in an hour etc). However 2 pi radians is less arbitrary and more useful for calculations.
Pi is equal to 180 so i complete circle is 360 equal to 2pi
Hope there is a mistake at 5:40
Red starts from top (peak at top)
Blue also starts from top
Not true for slinky spring
Plz correct me if I am wrong
You are wrong. If the end of the slinky is fixed, it must be at equilibrium.
@@ScienceShorts www.physicsclassroom.com/mmedia/waves/fix.cfm
Someone help, why is it over 4 and not over 2 anymore ? I was getting it now I'm lost
Which part?
justtt wow
Sir, how do particles move at each point in a standing wave....I.e. the motion of particles at different times
+scienceshorts
I have the same question
at the antipodes they move up and down from max to equilibrium to min and back up, at nodes the particles are stationary at equilibrium.