RGB Diode Colour Mixing - GCSE Physics

A simple demonstration with large LEDs showing how the primary colours of red, green and blue can mix to produce white light.
Thanks for watching,
Lewis
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[@merkabaenergy9558]

Great Video where do you buy your LED's please?

[@gowrissshanker9109]

Respected sir, I have some questions, it would be very helpful if you could answer for me,.... 1)Is it possible to produce em waves by oscillating the magnet to certain frequency?....if possible please explain how it's created sir
2)Can we produce em waves by oscillating the vandegraff generator?what's the difference between em wave produced from magnet, vandegraff,and AC current?
3)where does the energy of em wave come from?where the energy of em wave taken away from??
4) how can an object obsorb the em wave...what does black body do when em wave falls on it,does it produce out of phase light wave which destructively interfere on incident wave...how can a em wave be destroyed?
5)can linearly accelerating, circulating, spinning charge produce light? How will that light look like?
6) does all AC circuits produce em waves, will AC circuit glow visibly when its frequency is frequency of visible light....why DC current does not produce em waves.... even though electrons collide with nucleus of the conductor and losses energy and ACCELERATES?
7)Why cannot neutral objects (Eventhough having positive and negative charge) does not produce em waves ...is it possible to produce em waves by shaking or vibrating the neutral object to certain high frequencies....how black bodies produce em waves??
Thank you sir

[@thelearningdestination1579]

Hello sir
Today we had an exam of physics A level Cambridge 9702
There was a Doppler effect question in which i am confused
Q is as follows
A boy is playing an RC toy car and moving it in a straight line
Velocity of car for first 2s is constantly increasing from zero,straight line
From 2-4s velocity is uniform with no gradient
From 4-6 s velocity is decreasing constantly to zero with a straight line
Graph is a trapezium btw
He asks
State how observed frequency change for boy from time
i)0-2 sec
ii)4-6 sec
In 0-2 secs it’s obviously decreasing as source moving away from body
In part ii).
There is a confusion
Some say it will decrease cuz source is still moving away from body even velocity is decreasing so frequency will decrease with a lower rate increase
While others say it will increase cuz if velocity is less than previous so denominator of doppler effect formula will be smaller as we will add source velocity and waves velocity so frequency increases