All of WAVES in 15 mins - AS & A-level Physics
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- Опубликовано: 25 июл 2024
- scienceshorts.net
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00:00 Wave equation - frequency & wavelength
01:38 Refraction
02:51 Total internal reflection & optical fibres
04:42 Lenses
06:53 Polarisation
07:38 Phase
09:02 Stationary waves
11:02 Young's double slit
13:47 Diffraction grating
quite literally in every sense of the word, life savers. Thank you
JUST WHEN I NEEDED IT THE MOST 😭😭
thank you so much this is so concise and helpful! having my as physics exam day after tomorrow, hopefully i can get an A
I love you
Thank you for making this topic easy af for me
Splendid video!!! But, could you also cover Malus’s Law as well?(CIE A Level Physics)
legend
unlike whats shown in the video, Ive learnt many times that horizontal filters block vertical and vertical filters block horizontally orientated light, Is this wrong ?? Thanks
That's what I used to think too! But it's wrong. At least, more wrong than right.
In reality, polarisation is WAY more complicated and weird than this simple model. For example - which wave are we considering - the E or the M?!
Put simply, the electrons in a filter/antenna must be able to oscillate if they are to absorb waves - so a vertically polarised wave will be absorbed by those in a vertical line. (This is still a mickey mouse explanation...but then even the best one is too at the end of the day).
The only thing you need to know for A-level is that turning the filter 90 degrees results in a max to min intensity transmitted.
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12:17
You didn't show the derivation of the diffraction grating formula? That's a required spec point?
For what board?
@@ScienceShortsAQA, check the spec it says "Derivation of dsinθ = nλ"
Ah well - I've never seen a question require that in a paper.
Hopefully you can make a triangle and use trig - it's easy!
@@ScienceShorts yeah it's not too bad actually pretty easy learn actually. Do you think solely your revision videos and practice questions are sufficient for a high A*. Or is there any extra content/things to know when aiming for 90%+?
Well, lots of my students got A*s when I taught in school, and I didn't really do anything that differently to what's in my videos!
But yes, practice questions are the key.
FORTNITE