Sorry if this seems painfully obvious. Why is it that when a laser is shone through Young’s double slit you get stripes from the interference pattern and when you shine a laser through a diffraction grating you get circles instead? I understand that the maxima/minima are more intense from the grating due to more slits so more interference, but not…[Read more]
Thanks very much for sharing your resources Brendan and Steve (and to Helen for compiling the index of simulations) – these are all extremely useful and I’m just disappointed that I missed the session!
Fantastic, thanks for all these responses and videos, they are brilliant and I will definitely use some of this in my next lesson on static charges. Links really nicely to ideas on potential difference and the flow of current as well.
Can anybody help explain why a fluorescent tube would light up (very briefly) when held by somebody around 1.5m from a Van der Graaf? The person holding the tube is not touching the dome and somebody else moves the earthing dome near the Van der Graaf (these two people are not in contact). When the earthing sparks the tube very briefly lights…[Read more]