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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...

Hi, I'm trying to more understand the theory behind the shear modulus for various materials and have come across this text: http://www.scribd.com/doc/49116294/Electronic-Basis-of-the-Strength-of-Materials-Gilman-J-CUP-2003 The chapter on shear modulus starts on page 153 and there is a part...

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.

While researching the double slit experiment and finding that even when only one photon is fired at a time and interference still occurs (so the photon must be traveling through both slits at once) i came up with a possible problem with the theory and wondered if anyone could help me see where...

Ok thanks Jeff and Gokul43201!

What do you mean pack them more tightly than cubes? The question is how many will fit into a 1cm^3 space which is a cube so i don't see how else i could do it. I'm probably wrong though so i would appreciate some clarification

I have been given a set of questions as a pre-course task for my physics AS level and i would be very grateful if somone could check my working and tell me if I'm on the right track. One of the questions is how many atoms (with a given diameter of 0.0000001mm) can you fit into a 1cm^3 space. To...

Thanks for the relpy. I understand it now Paul

Where i live in the UK all the A-level students have just had their results. It has been said on the news that a new A* level will be added to the A levels to differentiate between the bright and the very bright and that an example of an A* question would be: 8 million uranium atoms in...

Thanks for the replies. I understand it now.

I have managed to find out that waste products from fusion reactions are far less dangerous than those from traditional fission reactions but i cannot find anywhere that states what the waste products actually are. Can somone please tell me what the waste products from a deuterium and a tritium...

Thanks for clearing that up Warren. I did mean more as a thought experiment than a real world experiment i was just trying to phrase it so you knew what i was trying to ask. Thanks, Paul

Would i be right in saying that if a radioactive material (e.g. Uranium) is placed into sealed box then it would not radiate? i came to this conclusion through the Heisenburg uncertainty principle. If the particles making up the uranium are not measured then they don't decide on a quantum state...

Well the entire problem is as follows: You are at a corner deli with a craving for a sandwich, here's the menu: Breads: wheat, rye, white Meats: turkey, ham, salami Cheeses: American, Swiss, Cheddar, Gouda Toppings: Ketchup, Mustard, Relish, Lettuce, Pickles, Sour Cream, Cream Cheese...

Say i needed to calculate the different number of combinations there are if you have 10 items and can pick up to 3 of them. e.g you buy a sandwhich and have Ketchup, Mustard, Relish, Lettuce, Pickles, Sour Cream, Cream Cheese, Olives as available toppings but you can only choose up to three. how...

According to the article its permanent as long as you replace the water when needed. It couldn't run indefinatly because that would constitute perpetual energy i.e energy generated from nothing.

Can anyone shed any light on how this water powered calculator works please? http://www.thinkgeek.com/gadgets/electronic/7c17/ Thanks, Paul

Anyone have any thoughts on Dr. Randall Mills' new theory concerning the release of energy from hydrogen atoms? For those of you who do not know what this is here is a link: http://www.theregister.co.uk/2005/11/07/hydrino_generator/

The first "Wow" moment for me in physics was when i read Brian Greene's "The fabric of the cosmos" It was when he pointed out that light from a distant quasar can be split and focused by an interving galaxy to create an interference pattern, if an additional detector was to be switched on then...

I am sure i am missing somthing here so if somone could point out the mistake in my reasoning it would be appreciated. If say you are traveling in a car around a roundabout you must contine to put more power into the engine to remain at a constant speed e.g. 20 mph. When you reach the maximum...

I was on my way to school this morning and i suddenly thought of somthing about relativity that has been bugging me ever since. Would i be right in saying that one of Einsteins theories or relativity (cant remember which) says that accelaration is equal to gravity and that the force felt from...