Never trust what a double slit quotes as its separation. Always check with a traveling microscope!

#ITeachPhysics

A tiny bit of ferro fluid with a neodymium magnet to visualise magnetic fields in three dimensions

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No 25!?!

Great fun! If you tie some fishing line to it, and then a cup to the end of the fishing line another student can listen in. Do this a few more time and you can have a whole group of students involved simultaneously.

Great idea, thanks for sharing, I’m going to use this.