GCSE Physics - Waves 7 - Diffraction
Vložit
- čas přidán 4. 03. 2017
- This is a GCSE Physics revision video about diffraction of waves. It discusses the factors that can affect the amount of diffraction that happens and helps you to explain diffraction through a gap and at an edge. If you are studying Cambridge iGCSE - you only need to know this if you are on the triple science course - you do NOT need to know this if you are on Combined or Coordinated science courses.
6 years later and your videos are still important
wow the way you teach is certainly unique. Helped a lot with my revision thanks.
You’re welcome! Glad it helped :)
your teaching style is very unique and very good, you were able to explain what my teacher couldnt explain in 60 minute, in 6 minutes, hats off to you
Love these videos, you really are saving my IGCSE's
Very nice examples! It is very helpful! Understood it immediately
studying this just a three hours before my exam- thanks a ton
No worries - hope it went well!
@@lovattphysics6366 yes it did!! i did great :)
sameee
better to study after exam
@@lovattphysics6366 i'm a little late to update but i got an A lol
Hi there, when you give the example about how the radiowave being diffracted by the hill, why is the wavelength compared with the width of the hill but not the height?
Thank you I have got more material about the diffraction of wave 🙂🙂🎉
Great i have understood using ur method of explanation (the drawing and stuff)
I have a question regarding "ripples" from the iGCSE course, where they gave a wavefront diagram of refraction of ripples and proceeds to say:
*On the left the ripples are in deeper water and moving faster. they advance steadily forwards. On the right the ripples are moving more slowly. The right hand end of a ripple is the first part to enter the shallower water, so it has spent the longest moving at a slow speed. Hence the right hand end of each ripple lags furthest behind*
Can u please explain what this means cuz i am having trouble understanding this, thank you
Thank you
Thank you!
this has been so useful sir and thanks for this
It has really been
Why shorter wavelength produces smaller diffraction? This is so hard for me to understand...
You explained very well
Thank youuuuu
How about when the wavelength is greater than the gap diffracting the wave
Thanks.
what conditions must there be for the diffracted waves to be straight lines with curved edges instead of fully circular?
Rose good question. The parts of the wave that go straight through the gap just keep traveling straight and so there is always a bit of a straight section. But when the gap is small, this straight section is also small, so you can’t really see it and all you see is a big curve. Hope that helps!
This helped me a lot
same
Did anyone else’s physics teachers not teach this???
Ive understood what happens if wavelength is smaller or equal to the gap.. what happens when the the wavelength is much larger than the gap?
Also not much diffraction. You only get lots of diffraction when the sizes are similar!
Very well made video
I learned so much
Thank you Sir
but why does this happens? can you explain the why behind it?
Could we say then the wifi is being defracted as it is being spread throughout the house?
Absolutely, yes!
brooo we sitting for may/june can u make a video on refraction diagrams like this
May june tooo les goo I have my last 4 exams on the eighth (idk if its the same as you buts its the multiple choice ones)
@@modabinomar which variant bro? we have chem on 8th i think
@@Eyebroooo Im doing variant 1. Yea chem on tuesday and then physics and then 2 more and were done with IGs for good 🙌🙌
@@modabinomar whatt so you have physics and chem on 8th?
@@Eyebroooo no no chem on 8th and physics on the 9th
I'm studying GCE and i watched the video....*thug life*
wtf?
This does NOT explain why diffraction depends on wavelength. I wish people would have the integrity to admit they don't know.
David Howard thanks for the comment. I don’t think at any point I said I was going to explain why this occurs. I apologise if I gave that impression. There are several ways to explain it (as there always are with waves), but none of them are appropriate for GCSE students, whom this video is aimed at (it’s in the title). The simplest explanation (I think) is related to Huygens principle for a single slit. Each point along the slit becomes a source of a wave, and the narrower that slit becomes (and therefore the closer to the wavelength), the smaller the angular separation of the diffraction pattern peaks. If you take a look at some single slit diffraction patterns you will see what I mean. If the peaks are closer together, the intensity of the peaks decreases faster with angle, effectively meaning that the diffraction pattern is narrower. A.k.a. Less diffraction. If the gap is smaller than the wavelength then a similar thing happens as the gap gets progressively smaller. Searching for some of these terms in an A-level or IB textbook would be a good place to start if you want to find out more. The fact that I don’t explain it in the video has nothing to do with integrity or ignorance, it is just not appropriate for the intended audience of the video. Hope that helps.