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Registered Member #32
Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549
... wrote ...
I am not sure why, but I have yet to see a cosmic ray in mine--ever. I am not sure if it is that they are stopped by the polycarbonate (seems unlikely), or that they just aren't big enough to create a trail, the only trials I ever saw were the strait alpha's coming from the source.
I can't comment in full depth, but alpha particles are easier to pick up than other kinds of radiation. It could be something as simple as that.
Registered Member #119
Joined: Fri Feb 10 2006, 06:26AM
Location: USA
Posts: 114
I just built a Rue Goldberg machine for AP physics as an end of the year project. I used a laser for one of the steps and we decided to get some dry ice to make the laser more visible. Looks pretty cool. I think you could also put some phenophaline in some water with a bit of NaOH. Add some dry ice and it should go from pink to clear from carbonic acid forming.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
There is a methanol cosmic ray detector in the science museum where I have my lifter and Maglev display. Works great to visualise cosmic rays. I couldn't get it to work with an alpha source and couldn't work out why. Even allowing for an hour of temp equilibration. Perhaps the metal disturbed the temp gradient too much.
Registered Member #321
Joined: Wed Mar 15 2006, 03:33AM
Location:
Posts: 14
Avalanche wrote ...
Drop a load into a bowl of hot water, it creates 'heavy smoke' that leaves the top of the bowl and flows across the surface of the bench.
"bench eh" for our experiment it was the washroom floor (just don't flush it until all of the dry ice turns into a gas or else the plumbing can explode)
Registered Member #187
Joined: Thu Feb 16 2006, 02:54PM
Location: Central Ohio
Posts: 140
We have two long (about 36") aluminum plates at work, about 1/2" thick and 8" wide. If you put a piece of dry ice between them and let the plates squeeze it, it makes a horrible screaming sound.
The first time I did this people from other labs came to see what was making that sound. It's even louder if you push down on it.
Registered Member #288
Joined: Mon Mar 06 2006, 07:52AM
Location: Palmerston North
Posts: 32
I totally agree with the coke bottle and dry ice idea! They are relatively safe compared to other illict ways of making large bangs. Neighbours can be a problem though. If you have any pride just make sure no-one sees you rummaging around the the rubbish bin for used bottles. Its all about recycling!
This is kinda kewl but if you but a can of shaving cream in dry ice you can then cut away the can and are left with a solid block of shaving foam which will expand like crazy when it unfreezes. I've heard of it being put up peoples exhaust pipes but do as you please.
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Dry Ice
