The plastic plates are only on the right. The left is without the plastic. Once the left has finished melting I showed the set up of the right. With the commentary it is explained. Sorry for the confusion.

I have this video which explains diffraction grating spectra which is connected as it is all to do with the path difference from the two slits do that the waves arrive i. phase and constructively interfere. Diffraction grating spectra explained kzbin.info/www/bejne/fpXMaZ-IqLChkKM

Glad you liked it!

If you have a known mass of the isotope then from the rate of radiation being emitted you can calculate the half life.

Great to hear!

Good luck!!

see this video: 2a Finding the gradient of a curved line by drawing a tangent part 1 kzbin.info/www/bejne/mZq1gmuEZtudha8

Hope that means you found it useful!

You're welcome.

Great to hear you liked it. Even though the short is 3 minutes it takes a couple of hours to record the videos and plan out and record a clear explanation.

Glad you think so!

Glad you liked it!

Glad to hear it.

Thanks a lot!

I’m glad you liked it.

He's a really good explainer

Thank you, I will

Thanks for the sub!

Not sure what you are asking

I agree most people treat a who,e standard form number as one item. Hoping that my older model keeps going for many years.

Agreed

A really interesting question and great observation skills. I am not totally sure but I suspect that it is because the two suspension strings are not totally symmetrical and one gets stretched slightly more than the other which then sets up these rotational oscillations. To find out would require setting it up again without the copper block and seeing if the oscillations would happen still if you just twisted it slightly and released it. If I have time around my teaching I will investigate.

An interesting question. I don’t think there will be large eddy currents deep in the copper because that would be some distance from the magnet so the change in magnetic field would not be that great. If I had some different shaped bits of copper it would be interesting to try different thicknesses to see if the braking force changed much.

@@SimonPoliakoff Now I am curious!!

It is an established physics law called Lenz’s law and I explained how the law applied in this situation. You can read more about Lenz's law if you are interested.

You're welcome!

Magnetic braking is used in mechanical systems but for electric vehicles they tend to use regenerative braking so that the electricity produced can charge up the battery or go back to the national grid. This video shows this: m.kzbin.info/www/bejne/q5m4pKCteZVshsU

Yes that is a lovely experiment but I don’t have easy access to liquid nitrogen.

Glad it helped!

The changing magnetic field from the moving magnet induces an emf/ potential difference in the copper which makes a current flow in the copper. That current makes its own magnetic field which because of Lenz’s law opposes the change which caused it (which was the magnet moving) so the force between the two magnetic fields causes the magnet to slow down.

I made a full video explanation here: kzbin.info/www/bejne/m4rGaWaomt10jsk

The water actually gets forced out between the copper block and the plastic cylinder but it isn’t that obvious on the video.

@ oh … half asleep Thanks for to pointer Though I actually thought I saw some wizardry at work here lol

Yes. There is a good explanation further down the comments.