JRP95
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#361
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#361
(Original post by JamesSS95)
It is required, check the specification


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I meant as in a question that difficult will never come up, grade boundaries are already up at like 57/75 for an A so they wouldn't put anything that difficult in (as it would be a 5 marker minimum)
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amish123
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#362
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(Original post by jackerharder)
HELP
1.Page 33 of CGP book if you have got it (or otherwise):
Why is sintheta=1.22lamda/d ? Where do they get 1.22 from??


2.Also, What does the graph of scattering angle with diffraction look like (the mark scheme just says drawn correctly which is very useful)
The 1.22 is derived from the Bessell function, you don't need to worry too much about this.

The graph of electron diffraction around a nucleus looks like this:
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Are you talking about the Rayleigh Criterion here or are you asking about electron diffraction? The equations for both are subtly different.
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username1112782
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#363
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#363
Is anyone else doing the Applied option?
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Beth_L_G
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#364
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#364
How are people revising for this exam? With the small number of past papers I'm struggling. I've just been copy out my notes repeatedly, and recording myself saying them and listening back while eating or exercising

I don't know why. I find coming up with ideas for bio and chem revision easy. I think it's probably because I don't understand physics so well :/
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bugsuper
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#365
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(Original post by Beth_L_G)
How are people revising for this exam? With the small number of past papers I'm struggling. I've just been copy out my notes repeatedly, and recording myself saying them and listening back while eating or exercising

I don't know why. I find coming up with ideas for bio and chem revision easy. I think it's probably because I don't understand physics so well :/
Recent research has indicated that question-and-answer flashcards are one of the best methods of retaining information. I don't know what option you're doing, but surely you could find some way to incorporate this - maybe with the key explanations in place.

I still need to learn the stellar classifications and their corresponding temperatures. I think I know which spectral lines belong to each, but it'd be such a silly thing to lose a mark over.
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Beth_L_G
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#366
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(Original post by bugsuper)
Recent research has indicated that question-and-answer flashcards are one of the best methods of retaining information. I don't know what option you're doing, but surely you could find some way to incorporate this - maybe with the key explanations in place.

I still need to learn the stellar classifications and their corresponding temperatures. I think I know which spectral lines belong to each, but it'd be such a silly thing to lose a mark over.
Might try that thanks
I'm doing astophysics too. Spectral classes and hydrogen balmer lines is one of the only bits I actually do get haha
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bugsuper
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(Original post by Beth_L_G)
Might try that thanks
I'm doing astophysics too. Spectral classes and hydrogen balmer lines is one of the only bits I actually do get haha
There have been a number of REALLY EASY questions about how Balmer lines have formed as six-markers in past papers... which would just be a dream scenario for me, if that was actually on the paper. Explaining that for six marks is a breeze.
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lantern
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#368
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Could anyone please explain this to me? I see that they've done
activity x energy of one alpha particle x charge of an electron
But why?
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jon889
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#369
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(Original post by bugsuper)
Recent research has indicated that question-and-answer flashcards are one of the best methods of retaining information. I don't know what option you're doing, but surely you could find some way to incorporate this - maybe with the key explanations in place.

I still need to learn the stellar classifications and their corresponding temperatures. I think I know which spectral lines belong to each, but it'd be such a silly thing to lose a mark over.
what do you mean by the spectral lines belonging to star class.

(I hate how we have to learn these facts, this is what google is for in RL...)
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vgautam
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(Original post by lantern)
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Could anyone please explain this to me? I see that they've done
activity x energy of one alpha particle x charge of an electron
But why?
The activity of the source multiplied by the energy of the radiation will give you the power of the source (or the energy per second), that is the principle you apply to this question.
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bugsuper
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(Original post by jon889)
what do you mean by the spectral lines belonging to star class.

(I hate how we have to learn these facts, this is what google is for in RL...)


I mean things like spectral class B and A have Balmer lines from hydrogen, and spectral classes K and M have absorption lines from like metal compounds like TiO and stuff - if you have a table of information about the spectral classes it should be in that
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cooldudeman
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#372
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(Original post by JRP95)
I meant as in a question that difficult will never come up, grade boundaries are already up at like 57/75 for an A so they wouldn't put anything that difficult in (as it would be a 5 marker minimum)
55? What option module was this in? Like which was it phya5a/b/c/d?
I really doubt it was ever that high for turning points.

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cooldudeman
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#373
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Has anyone got any exam questions on the light topic in turning points? I find it hard

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smith50
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#374
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(Original post by posthumus)
I get confused with the avogardos contant bit

They've found the number of atoms,

it looks like to find the number of moles you do:

no. atoms / avogardos constant

Is this correct ?? Is the a formula they give us also.

Then once they've go moles, they've done
moles x molar mass = mass
Okay here are the documents hope you find them useful
I am doing them aswell let me know if you get stuck
Smith
Attached files
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smith50
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#375
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#375
(Original post by cooldudeman)
Has anyone got any exam questions on the light topic in turning points? I find it hard

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Specifically what on light e.g relativity hygens theory ... if i may ask
Smith
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Bobilina
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I'm actually quite gutted how my feelings have changed towards Physics this year. I loved it at As and I achieved a decent A grade. However i'm struggling with A2 physics and i'm also re-sitting Unit 4, bleugh I know!

On the plus i'm glad to be doing turning points, I quite like this section and the grade boundaries seem to be alright. How's everyone revising for it? I'm doing notes, flashcards and past papers but still finding it a slight struggle, boo
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smith50
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(Original post by Bobilina)
I'm actually quite gutted how my feelings have changed towards Physics this year. I loved it at As and I achieved a decent A grade. However i'm struggling with A2 physics and i'm also re-sitting Unit 4, bleugh I know!

On the plus i'm glad to be doing turning points, I quite like this section and the grade boundaries seem to be alright. How's everyone revising for it? I'm doing notes, flashcards and past papers but still finding it a slight struggle, boo
I've posted some questions you may want to give them a try Also doing turning points just revising some notes for that.
Smith
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Bobilina
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#378
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(Original post by smith50)
I've posted some questions you may want to give them a try Also doing turning points just revising some notes for that.
Smith
Ahhh yes I see them, thanks a bunch!
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posthumus
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(Original post by smith50)
Okay here are the documents hope you find them useful
I am doing them aswell let me know if you get stuck
Smith
Brilliant, thank you so much !

May I ask if there's also a mark scheme ?
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D4rth
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#380
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How's everyone finding the exam prep. Im doing applied physics and I think its mostly straightforward, just need to make sure I read the question properly.

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