Recent content by paulhunn

Ok well I've found a pretty good amount of info online and i think a good approach would would be to use an Arduino as an interface for the laser and receiver. Does anyone have any experience in using/coding one of these?

Yep the story is here: http://news.discovery.com/space/astronomy/nasa-beams-mona-lisa-to-moon-130118.htm

Recently in the news NASA has transmitted an image of the Mona Lisa via a laser beam and i was wondering about some of the theory behind how they did it and maybe trying to recreate something similar on a (much) smaller scale. I've seen some articles online that show a method for transmitting...

I've studied Young's slits and other diffraction type experiments and so understand how a light wave can interact and constructively or destructively interfere depending on path difference etc. My question is: why is this not more obviuos is everyday life? Say I'm looking at a cup placed on a...

Thanks guys that makes a lot of sense now i think about it.

Hmmm i always thought copper was pretty resistant to corrosion since it's used for water pipes etc and as a plating to an audio jack it's not exactly going to be under particularly harsh conditions.

Hi I was wondering why high end audio equipment is plated with gold when copper is obviously cheaper and has a lower resistivity. Anyone shed any light on this? Thanks Paul

Ok thanks Borek

Hi I have been set the following problem. Z2CO3(aq)+2HCl(aq) -> 2ZCl(aq) + CO2(g) + H2o(l) We did the experiment in class to find the amount of HCl it would take to titrate the soloution. First by measuring an amount of Z2CO3 and dissolving it into 250cm^3 of water and using methl orange...

So why is there no interference when only one slit is used if they are not going through both slits simultaneously?

ok thanks think that's cleared it all up

So what if the emitter was positioned so that a parallel line between the emitter and the receiver put the path of the photon through the left slit. making the path through the right slit fractionally longer?

so why does the interference disappear when only one slit is used?

Say the emitter pointed straight at the slit on the left then a straight line between point A and B would be directly through that slit. to interfere it would have to travel through the other slit as well, a longer distance. so being longer it would mean the photon had traveled slower than light...

Yes but a perfectly straight line would restrict the photon to only traveling through one slit. to go through the other slit would require taking a longer path than the 1st slit.