Physics help (again)

dansweet123 · June 2007

ok my as exam is tomorrow just need to enquire about a few things with the mbuk physics boffins [:)]
In section C questions i've been doing, the question has been along the lines of "In this question you are to choose and write about a phenomenon that can be explained in terms of quantum behaviour, and the relevance it would have to physics today"

Most other section c's i came up against were fine, but this one i havent a clue which (or what) phenomenon to talk about?
any ideas?

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Originally posted by El Capitano

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Mythic · June 2007

particle wave theory?? quantum tunneling????

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Red Lemon · June 2007

I don't know what they're looking for specfically, because I haven't seen the kind of thing they teach at A level since I did it 5 years ago. But the Photoelectric effect, perhaps?

DahnHilla · June 2007

Unicorns?

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Mythic · June 2007

quantum tunneling occurts in silicone chips wen i particle such as an electron can behave as a wave and move from wone pat of the circut to another through an insulator it limits how small u can make computer chips !!!! very interesting stuff froma genius 15 yr old

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dansweet123 · June 2007

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Red Lemon

I don't know what they're looking for specfically, because I haven't seen the kind of thing they teach at A level since I did it 5 years ago. But the Photoelectric effect, perhaps?

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Photoelectric effect seems a decent option i just need learn a model answer. I was thinking about diffraction grating but didnt know quite how it applied to anything, or how i could explain it as a phenomenon

quote:
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Originally posted by El Capitano

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dansweet123 · June 2007

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Mythic

quantum tunneling occurts in silicone chips wen i particle such as an electron can behave as a wave and move from wone pat of the circut to another through an insulator it limits how small u can make computer chips !!!! very interesting stuff froma genius 15 yr old

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we havent covered that in the syllabus so thats no help really, cheers anyway

quote:
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Originally posted by El Capitano

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Mythic · June 2007

oh kk lol i didnt know which syllabus you were on. what university are u at

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Anonymous · June 2007

i imagen its a levels as my sis is doing her pyhsics tomorrow i think

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hazzahulme · June 2007

I'd say Photoelectric Effect too, nice and easy, plus you can add that it won Einstein his nobel prize as a bit of extra info! I wouldn't recommend a diffraction grating as it's quite hard to explain accurately in quantum theory as it involves probability functions which I didn't know about when I did A-level.

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Oldmacdonald

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dansweet123 · June 2007

yep this is only AS! i kind of understand gratings and they give more scope to talk about phasor arrows etc, which means i'd be able to waffle on more. However, photoelectric effect looks to be the only actual Phenomenon i can find any details of. Damn im not looking forward to these two tests.

quote:
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Originally posted by El Capitano

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hazzahulme · June 2007

I would think that the diffraction pattern obtained from a diffraction grating would be a phenomenon.

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Oldmacdonald

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dansweet123 · June 2007

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by hazzahulme

I would think that the diffraction pattern obtained from a diffraction grating would be a phenomenon.

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Oldmacdonald

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ok thats very true i now feel stupid.

quote:
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Originally posted by El Capitano

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dogtanian · June 2007

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by dansweet123

ok my as exam is tomorrow just need to enquire about a few things with the mbuk physics boffins [:)]
In section C questions i've been doing, the question has been along the lines of "In this question you are to choose and write about a phenomenon that can be explained in terms of quantum behaviour, and the relevance it would have to physics today"

Most other section c's i came up against were fine, but this one i havent a clue which (or what) phenomenon to talk about?
any ideas?
<hr height="1" noshade id="quote"></blockquote id="quote">

Yer...

Quantum behaviour is seen in the Photoelectric Effect, diffraction gratings, electron microscopy, and other cases where light exhibits behaviour of a wave as well as a particle (i.e. Wave Particle Duality) http://en.wikipedia.org/wiki/Wave%E2%80%93particle_duality

BUT... In terms of [natural] Phenomena, i guess you could go on about the Northern Lights... where electrons in a particle are excited and elevated [promoted] to another energy/valency band, and then the electron dropping back down to a lower band while emitting a a packet of light in the form of photons in a quantum rather than continuous frequency [colour] according the rather simple formula:

E=hf

where...

E = energy in Joules
h = Planck's constant
f = freq of the packet of light.

This is why the northern lights are discrete colours of the spectrum (normally green and a few select other frequencies) rather than continous liek a big gay rainbow... which is continous (rather than quantum) since it's caused by light being bent i.e. gayness of light.

Relevance to physics today... you could probably make a tentative link to Electron Microscopy, or sealed Halide light bulbs which have an inert gas in them in order to make a pretty colour when electricity is passed through them.

Anyway... you should be able to blag it from there... if you're on irc, i could prolly spend a bit of time this evening going through it (my e-mail on here goes through to me old exeter uni address which is now fux0rd).

gl mate.

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dansweet123 · June 2007

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by dogtanian

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by dansweet123

ok my as exam is tomorrow just need to enquire about a few things with the mbuk physics boffins [:)]
In section C questions i've been doing, the question has been along the lines of "In this question you are to choose and write about a phenomenon that can be explained in terms of quantum behaviour, and the relevance it would have to physics today"

Most other section c's i came up against were fine, but this one i havent a clue which (or what) phenomenon to talk about?
any ideas?
<hr height="1" noshade id="quote"></blockquote id="quote">

Yer...

Quantum behaviour is seen in the Photoelectric Effect, diffraction gratings, electron microscopy, and other cases where light exhibits behaviour of a wave as well as a particle (i.e. Wave Particle Duality) http://en.wikipedia.org/wiki/Wave%E2%80%93particle_duality

BUT... In terms of [natural] Phenomena, i guess you could go on about the Northern Lights... where electrons in a particle are excited and elevated [promoted] to another energy/valency band, and then the electron dropping back down to a lower band while emitting a a packet of light in the form of photons in a quantum rather than continuous frequency [colour] according the rather simple formula:

E=hf

where...

E = energy in Joules
h = Planck's constant
f = freq of the packet of light.

This is why the northern lights are discrete colours of the spectrum (normally green and a few select other frequencies) rather than continous liek a big gay rainbow... which is continous (rather than quantum) since it's caused by light being bent i.e. gayness of light.

Relevance to physics today... you could probably make a tentative link to Electron Microscopy, or sealed Halide light bulbs which have an inert gas in them in order to make a pretty colour when electricity is passed through them.

Anyway... you should be able to blag it from there... if you're on irc, i could prolly spend a bit of time this evening going through it (my e-mail on here goes through to me old exeter uni address which is now fux0rd).

gl mate.

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if i even knew what this was[:I]
I've broken it down between the two papers, section c wise for "phyics in action" it will be a question about:
-A material (youngs modulus etc.)
-Imaging (im using ultrasound as my example)
-Transmitting a signal (im using telephones, sampling, binary code etc)
-Sensor system (i'll use my c/w for this, i built a fan for a pc)

for "understanding processes" i rekon i will be questioned about either:
-Quantum phenomenon (i'll probably do photoelectric effect, about photomultipliers if that sounds right??)
-Superposition of waves (Diffraction grating)
- Acceleration of objects (piss as i've done M1)
-Remote measurements (ultrasound again, or any other better suggestions?)
- Standing waves (not a clue what to write about, guitars maybe??)

Dogtanian does this sound about right?

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Originally posted by El Capitano

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hazzahulme · June 2007

For standing waves, I think microwave ovens are good examples. And for superposition of waves I'd use Young's Double Slit Experiment over a diffraction grating, it's a bit easier to explain the fringe pattern.

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Oldmacdonald

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ard nut · June 2007

What modules this? 4?

I happen to have PHY2 tomorrow. So count me as cool too.

dogtanian · June 2007

Yeah - all looks good to me.
Half the art of getting high mark in physics exams is making it easy for the silly bint teachers to mark.

Use bullet points and underline key points wherever possible.. try to second-guess what their mark-scheme looks like and go for the 'one mark per bullet-point' strategy.... rather then long essay-type sentences which are difficult to mark.

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dansweet123 · June 2007

all really good advice guys, yep i've had a look over past mark schemes and they want you to put something together thats clear with well made but short points. hazzahulme, thats actually a very good idea, the young's slits [/giggle] is easier to explain, i'll have a look over it now, as for the microwave, could you outline the main points i could use for it?

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Originally posted by El Capitano

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dogtanian · June 2007

No!

Don't try to use the example of microwaves to explain Standing Waves.
Microwaves work through resonnance of water molecules which is altogether different.

Guitars or water ripples are a far better example.

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dansweet123 · June 2007

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by dogtanian

No!

Don't try to use the example of microwaves to explain Standing Waves.
Microwaves work through resonnance of water molecules which is altogether different.

Guitars or water ripples are a far better example.

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standing waves in microwave ovens came up in the past and it looks ok to put into practice, the standing waves part is the bit im struggling with most now, i'm not sure i could write 10marks worth about standing waves on guitar strings? I really need some pointers on either the guitar strings or microwave ovens?

quote:
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Originally posted by El Capitano

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dogtanian · June 2007

A Microvave Oven does *NOT* use standing waves...
Since Standing Waves do not result in net propagation of energy.

http://en.wikipedia.org/wiki/Standing_wave

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dansweet123 · June 2007

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by dogtanian

A Microvave Oven does *NOT* use standing waves...
Since Standing Waves do not result in net propagation of energy.

http://en.wikipedia.org/wiki/Standing_wave

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i see where your coming from but look at this: Question 10

quote:
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Physics help (again)

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