2010 HSC Physics Revising Marathon (1 Viewer)

[Pwnage101]

To all '10 HSC Physics students,

With your trial examinations fast approaching, i thought it would be a good idea to start a thread where you can help each other learn.

Rules:
The OP posts a question, first person to get it correct asks the next question, and so on.

Note: try to give a full solution (As you would in the exam). If you think someone else's solution is incomplete, add to it!

You can use the Equation Editor for any calculation questions or formulae. For a guide on how to use it, refer to this thread created by Jetblack2007 on the Mathematics forum.

Remember to keep it relevant to the HSC Syllabus!

[Since there are several different options, please stick to the 3 core modules.]

First Question:

Outline Einstein's explanation of the photelectric effect. (4 marks)

EDIT: This thread is intended fro 2010 HSC Physics students. As such, only these students should attempt to answer the questions posed first, then previous HSC Physics students can criticise/add to their answers.

 

[nat_doc]

the photoelectric effect is the phenomena where electrons or photoelectrons are emitted from the surface of a metal given that the correct threshold frequency is provided. Classical wave theory suggests that as the waves of light hit the surface, the light energy will build up over time and emit an electron, but experimental data disproved this. Einstein then came along and hypothesised that light is made of particles called photons, which are discrete packets of energy. he then stated thatt he energy of each photon is defined by its frequency . this explained why emission time was instant and why a certain frequency (or amount of energy) was needed. he called the minimum amount of energy required for photoemission the work function


is that good enough?

Sounds good to me! - Pwnage101

Second Question:

Discuss the debate of the differing nature of light and what property of cathode rays dose the Maltese cross show. [4 marks]

 

[darkchild69]

I would suggest also adding something about either none or all of the energy of the photon being transferred to the electron and any energy above the work function being transformed into the KE of the electron. (perhaps directly after where you put the equation E=hf)

Apart from that, sounds good.

 

[nat_doc]

OMG party poppers... keep this thread going

 

[hscishard]

Prob will in the next years one.

 

[Pwnage101]

OMG party poppers... keep this thread going

It's up to you (Hsc Physics '10 Students) to keep this thread going!

Second Question:

Discuss the debate of the differing nature of light and what property of cathode rays dose the Maltese cross show. [4 marks]

 

[hello-there]

OK heres a question
Q) In a galvanic cell a voltmeter is used. If a voltmeter has an infinite resistance, how can electrical energy flow through to the other electrode.
Q) Also how can the ions in the electrolyte replace electrons from the anode.

probably will end this thread for good

 

[hello-there]

OK heres a question
Q) In a galvanic cell a voltmeter is used. If a voltmeter has an infinite resistance, how can electrical energy flow through to the other electrode.
Q) Also how can the ions in the electrolyte replace electrons from the anode.

probably will end this thread for good

 

[Shayren]

The maltese cross gave a clear reflection of the cross as flurecense on the end of the vacuum tube, this showed that;
- cathode rays traveled in straight lines
- cathode rays were stopped by thin sheets of metal
- cathode rays gave off a green glow when contacted with glass
Overall this gave evidence for both as while waves oscilate (so they do not travel in straight lines) light is stopped by thin sheets of metal, and does give of a flurescence.

^ appologies for horrid spelling throughout, bad speller is bad.

My question:

Discuss the differing views of Einstien and Planck on weather or not science is removed from Political and social forces

 

[random-1006]

The maltese cross gave a clear reflection of the cross as flurecense on the end of the vacuum tube, this showed that;
- cathode rays traveled in straight lines
- cathode rays were stopped by thin sheets of metal
- cathode rays gave off a green glow when contacted with glass
Overall this gave evidence for both as while waves oscilate (so they do not travel in straight lines) light is stopped by thin sheets of metal, and does give of a flurescence.

^ appologies for horrid spelling throughout, bad speller is bad.

My question:

Discuss the differing views of Einstien and Planck on weather or not science is removed from Political and social forces

thats like definately going to be asked either this yrs hsc or next yrs hsc, it hasnt been asked in 9yrs, by then you thought they would have touched about every dot point.

 

[nat_doc]

My question:

Discuss the differing views of Einstien and Planck on weather or not science is removed from Political and social forces

Einstein was purely for science. he believed that science should benefit humanity and not a country alone. Planck on the other hand, was influenced by the notion that science should be at service to the country. he signed a treaty that agreed that his country should engage in war-fare. Despite E and P being good friends, their motives were obviously different. E showed his sorrow when his discoveries were used for war when the A-bombs were dropped, killing the lives of many. Hence, it can be seen that science is removed from polictical and social forces in the case of Einstein and not in the case of Plank.

that was a bitch

NEW question:

what are the problems associated with re-entry and what conditions must be meet to ensure the safety of the people on board? (4 marks)