HSC Physics: Suggested Answers and Discussion

[Cindy2k16]

Speaker question got me too; we can despair together sounds like you did great on the whole in a hard section!

You'll get 2/3 just for the working, don't let it stress you!

You will be fine; this was a tough exam and it sounds like you did really well on the whole. Don't stress, it's done now, just party!

For the working out of 30a, is the second work for correct working out? Since I can't remember I dont know if my mistake was somehow accidentally writing in the numbers wrong D:

[ParallelPlatypus]

Quanta to Quarks Solutions (My Solutions?!):
I realised I mixed up weak and strong force in my paper haha, I fixed it here though. I imagine a moderator can place these solutions in the official ones if they are happy with them.

These solutions have been moved to the first post in this thread!

[FallonXay]

Quanta to Quarks Solutions (My Solutions?!):
I realised I mixed up weak and strong force in my paper haha, I fixed it hear though. I imagine a moderator can place these solutions in the official ones if they are happy with them.

Ai) Neutrons and protons. Protons are positive, neutrons negative.

(Neutrons are neutral btw Thanks for posting your solutions!!!

[ParallelPlatypus]

Hahah woops- fixed above

[FallonXay]

c) Pauli = Pauli’s exclusion principle which used the three quantum numbers to provide an explanation of the unique states of electrons in their orbits (e.g. 2,8,18 etc.) Pauli explained the quantum arrangement of electrons in the hydrogen atom, making Bohr’s model more credible and justified.
Heisenberg = Matrix mechanics which supported Schrodinger’s probabilistic wave function- lead to the conceptualisation of the quantum probability cloud adaptation of the Bohr model. The Heisenberg Uncertainty principle implies an inaccuracy in measurement which lends further support to an uncertain interpretation of orbital positions and momentums.

Also, I may be wrong, but weren't there 4 quantum numbers? (Principal, Orbital, Magnetic, Magnetic Spins)

[FallonXay]

Hahah woops- fixed above

Awesome 

[FallonXay]

e) Pretty standard question- you should mention his work in neutron bombardment experiments in which he discovered that slower thermal neutrons were more effective in producing fission. He worked in the Manhattan Project and created the first working nuclear reactor. This involved pioneering moderators like graphite and control rods made of cadmium or boron. This is reflected in modern nuclear reactors which have similar components. You can then talk about the impacts of nuclear reactors on society. E.g. clean energy and the production of isotopes (where I dumped my prepared isotopes, I did industrial and medical, and related this to their societal impact). You could also relate the discussion of the rate of nuclear reaction and controlled/uncontrolled reactions to nuclear weaponry + plutonium 239 production from nuclear reactors. Then you can discuss the pros and cons of nuclear weapons which are well documented. This was my take on the question

Awhhhh, nice ~ I completely forgot about radioisotopes 
Nice thinking!

[ParallelPlatypus]

Shit, you are right haha, hopefully the marker is asleep when I said three quantum numbers... Fixed above, thanks

[jamonwindeyer]

So judging by the little information offered by the raw marks database.....is a raw mark of say, 85% for this exam going to award a band 6? Lower? Higher?

This was a really tough paper in my opinion, I'm expecting a fairly low Band 6 cut-off this year! Probably low 80's for a Band 6? We'll have to wait and see!

17/20 FOR MULTIPLE CHOICE AND LEGIT ONLY STUDIED 2 1/2 DAYS.. Award plz 😂

Dayum, legend! Well done!

For the working out of 30a, is the second work for correct working out? Since I can't remember I dont know if my mistake was somehow accidentally writing in the numbers wrong D:

You'd get like 1 mark for correct approach, 1 mark for correct formulae, 1 mark for correct numerical answer? Something like that? If you literally just subbed a wrong number you'd definitely get the two marks, if you miswrote the formula as a silly mistake you'd probably still get two marks too!

[jamonwindeyer]

Quanta to Quarks Solutions (My Solutions?!):
I realised I mixed up weak and strong force in my paper haha, I fixed it here though. I imagine a moderator can place these solutions in the official ones if they are happy with them.

I've put them in with the main post; you are awesome!!

[ladyofathena]

Ughhh so mad at myself. Only looked at MC but already lost like 5 marks and I really did not like my answers for the rest of the paper. I was on track to get a band 6 but I think the highest I'll get is in the low 80's.

Didn't realise the loudspeaker wasn't connected to anything lol

[jamonwindeyer]

Ughhh so mad at myself. Only looked at MC but already lost like 5 marks and I really did not like my answers for the rest of the paper. I was on track to get a band 6 but I think the highest I'll get is in the low 80's.

Didn't realise the loudspeaker wasn't connected to anything lol

Neither did I

Don't worry, you know about Band cut-offs and stuff right? A mark in the 80's should still nab you a Band 6!   you just never know with this sort of thing, stay confident!

[ladyofathena]

Neither did I

Don't worry, you know about Band cut-offs and stuff right? A mark in the 80's should still nab you a Band 6!   you just never know with this sort of thing, stay confident!

Haha thanks Jamon, I do know about the cut offs but I'm always thinking the worst particularly since my friends found the exam fine. Just have to do my best for chem and then I'm done!

[jamonwindeyer]

Haha thanks Jamon, I do know about the cut offs but I'm always thinking the worst particularly since my friends found the exam fine. Just have to do my best for chem and then I'm done!

No stress! Get keen to finish up and party!

[hungrybubbles]

I feel like question 20 is D, if it were DC it would be continuously clockwise, but with  AC - the brushes dont change the sides every half turn . unless they do .