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Author Topic: Edexcel PHYSICS Doubts  (Read 136113 times)

Offline The Golden Girl =D

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Re: Edexcel PHYSICS Doubts
« Reply #645 on: June 05, 2011, 02:42:18 pm »
Quote from: MasterMath on June 05, 2011, 02:40:43 pm
I just want to make sure of something correct me if im wrong
In the photo electric effect .. when your shinning radiation on a metal's surface. If you increase the intensity you increase the number of electrons getting knocked out, but if you increase the frequency your just increasing the K.E the electrons gain right? So frequency has no effect on the current(number of electrons emitted)?

Yes :)
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Offline Malak

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Re: Edexcel PHYSICS Doubts
« Reply #646 on: June 05, 2011, 02:43:53 pm »
Yeah ur right...

Frequency effects KE
And intensity effects no of electrons emitted (if the frequency is equal to the threshold frequency)

Good Luck Everyone...! :D
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Offline MasterMath

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Re: Edexcel PHYSICS Doubts
« Reply #647 on: June 05, 2011, 02:45:06 pm »
Lets hope its mostly electricity.. i hate waves.. Got no time to study it properly..Shouldnt of done A2 and AS in the same year  :'(
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Offline Malak

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Re: Edexcel PHYSICS Doubts
« Reply #648 on: June 05, 2011, 03:14:20 pm »
Lol..Can we just hope its easy?  ::) ( I dont like electricity) :D

Oh..I am going to do Biology next year this way..!  :-\
Looks like its quite stressful..
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Offline The Golden Girl =D

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Re: Edexcel PHYSICS Doubts
« Reply #649 on: June 05, 2011, 03:44:46 pm »
Quote from: MasterMath on June 05, 2011, 02:45:06 pm
Lets hope its mostly electricity.. i hate waves.. Got no time to study it properly..Shouldnt of done A2 and AS in the same year  :'(

Not trying to discourage you or freak you out  , but my teacher said that a very big portion of the exam  questions'  in the exam are usually Waves ,so I suggest you do take it seriously :)
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Offline Malak

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Re: Edexcel PHYSICS Doubts
« Reply #650 on: June 05, 2011, 04:01:09 pm »
Yeah, GG is right..
And If you need help with any specific point/topic in wave, we all can help :)
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Offline EMO123

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Re: Edexcel PHYSICS Doubts
« Reply #651 on: June 05, 2011, 05:14:39 pm »
Quote from: Ghost Of Highbury on June 05, 2011, 04:52:49 pm
Can the edexcel students try this one too plz? :D
ask this to master_key i know that he knows this
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Re: Edexcel PHYSICS Doubts
« Reply #652 on: June 05, 2011, 06:11:21 pm »
Quote from: EMO123 on June 05, 2011, 05:14:39 pm
ask this to master_key i know that he knows this

Hmm where is the post  :-X  :-\
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Offline Ghost Of Highbury

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Re: Edexcel PHYSICS Doubts
« Reply #653 on: June 05, 2011, 06:15:19 pm »
Quote from: The Golden Girl on June 05, 2011, 06:11:21 pm
Hmm where is the post  :-X  :-\

Ari answered it, I deleted it. Sorry :-)
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Offline The Golden Girl =D

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Re: Edexcel PHYSICS Doubts
« Reply #654 on: June 05, 2011, 06:17:24 pm »
Quote from: Ghost Of Highbury on June 05, 2011, 06:15:19 pm
Ari answered it, I deleted it. Sorry :-)

It's okay :)
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Re: Edexcel PHYSICS Doubts
« Reply #655 on: June 05, 2011, 06:17:57 pm »
Attached.

My exam is tomorrow so please reply ASAP !

Hmm I need an explanation for :

in Section A in Q 5 , I just want to know why is it ODD , is it Always ODD ? *I thought it shouldn't be a whole number and that's it.* ,so let me know Please !

Section B

Q. 14]c) , 19]c) *I need a diagram of it  :-\ * , 21]c)ii)

Thanks in advance :D
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Offline rameeziiii

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Re: Edexcel PHYSICS Doubts
« Reply #656 on: June 05, 2011, 06:28:08 pm »
Quote from: The Golden Girl on June 05, 2011, 06:17:57 pm
Attached.

My exam is tomorrow so please reply ASAP !

Hmm I need an explanation for :

in Section A in Q 5 , I just want to know why is it ODD , is it Always ODD ? *I thought it shouldn't be a whole number and that's it.* ,so let me know Please !

Section B

Q. 14]c) , 19]c) *I need a diagram of it  :-\ * , 21]c)ii)

Thanks in advance :D

it is an odd number of half wavelengths. the half wavelength gives a path difference of 1/2 lambda or 180 antiphase compared to the original wave. thus when superimposition occurs, destructive interference occurs. if the difference is of even number of half wavelengths or whole numbers of wavelengths, the phase difference is 0 and thus constructive interference will occur.
« Last Edit: June 05, 2011, 06:30:19 pm by rameeziiii »
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Offline The Golden Girl =D

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Re: Edexcel PHYSICS Doubts
« Reply #657 on: June 05, 2011, 06:30:41 pm »
I get  the thing about the Odd :)
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Offline Malak

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Re: Edexcel PHYSICS Doubts
« Reply #658 on: June 05, 2011, 06:37:06 pm »
For 19 c..Is the same like how blue light refracts, but since red has a shorter wavelength it will be refracted less than blue light. If you wanna be accurate than measure the angle of refraction for blue light then then draw the line for red.
« Last Edit: June 05, 2011, 07:30:21 pm by ang3l »
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Re: Edexcel PHYSICS Doubts
« Reply #659 on: June 05, 2011, 06:41:36 pm »
I'll scan my answer so that you tell me if it's right or not :)

EDIT: Attached.
« Last Edit: June 05, 2011, 06:46:07 pm by The Golden Girl »
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