De Broglie wavelength. Bohr atom (3)

[occamsrazorblades]

I disagree. Graphics (like powerpoint) are the crutch of lazy educators and students who want to read a pre-written presentation. This is among the best educational videos because the student is led through the entire thought process. It also demonstrates to the "internet savvy" generation what truly understanding a subject is (versus "googling it").

[DanFrederiksen]

also 700nm is at the edge of the visible spectrum. a rule of thumb is that red, green, blue is around 650, 550, 450nm respectively.

red is around 500THz or half a petaHertz.

good video but a refined much faster version could be formulated from the experience. graphics could be prepared as opposed to slowly formed on the blackboard. I set a lofty goal but just saying in case you want to go for something exceptional. I would suggest QED as the first topic. I think that would have greatest appeal

[pjholl]

Your frequency appears to be 14 orders of magnitude too small. A freqency of 4.3Hz corresponds to a wavelength of almost 70,000km. It should read 4.3x10^14Hz for a wavelength of 700 billionths of a metre.

Very good educational vid.