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Yes, as far as I can tell spin isn't actually an observable property, it's a description of how it's angular momentum behaves mathematically. The whole concept of a point mass being able to spin is absurd-it has no axis on which it can rotate! Hence why its called "intrinsic spin" 1/2 spin...

Ahh, very clever. Thanks ;)

So we dont do the 2 unit exam....but those 2 units are still counted, right? So what kind of mark do we get for them?

It also lets us see some of the properties of the different radiation types: Alpha rays produce thick, short trails-suggesting they are large with little penetrating ability. Beta produces very thin long trails-small, highly penetrating particles. As for gamma, you cant really detect...

No worries! I enjoyed it. Thanks for the hints, too, Forbidden... Yes...Beatles rock.

Aim too of course, and interpretation of results

Yes! I'm pretty sure ive seen a question like that before somewhere...Foamed polystyrene is a good heat insulator as it has lots of air pockets in the bubbly bits i think....

Ok, hope this helps... There are two physical steps to Thompson's experiment, the rest is purely mathematical THE EXPERIMENTAL STEPS Step 1: Place an electric and a magnetic field on a cathode ray tube so that their force on the electrons in the cathode ray balance each other. When the...

For a very complete explanation (i mean, you have to skip over heaps cause its too basic) theres always particleadventure.org. Theres a wonderful poster there too...

This is an interesting question, I always remeber the answer by imagining the force exerted on a parachuter when they open the chute (the parachute, of course, is used to decelerate). So easy to get wrong tho...its the opposite of what you'd think..

Polarity, in this sense, is simply the direction in which the electrons are flowing, i.e. which end of the coil we call positive and which we call negative

2nd July is e Day!!!! Not quite as good as pi day, but still a whole lot of mathing fun! What will you do in memory of e that day?

So how do you do your volumes by shelling? My teacher and some of the textbooks im using say to do it by finding the circumference of the shell as the width of its sides tends to 0, then using this, the length and the height of the shell to calculate the volume etc...but the Cambridge text uses...

xFunctions is good too, and free http://math.hws.edu/xFunctions/

I just think they're are really good revision...and i really dont want to lock myself into 4 unit just yet, just incase...

I really wish i had one.....i use them at school whenever i study. It makes maths so much easier!