Edexcel physics Unit 2 IAL 2017 may/June unofficial mark scheme Watch

Luj99
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#1
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How was the exam guys? I found it quite easy.
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Helper OF ALL
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(Original post by Luj99)
How was the exam guys? I found it quite easy.
pretty easy ..... but that last question last part was **** .. i dunno what to do there.....
secondly what was the mas power in internal resistance
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Luj99
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What I did for the last question was, I used my protractor to calculate the angle. the scale was (20 degrees in paper=40 degrees and then I converted using the value I calculated for the angle.After that I used the formula (μ1v1=μ2v2) to get the refractive index.the value I got was 1.12 I think
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Luj99
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Not sure if it will be correct though
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quraisht
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what about the left and the right ear??
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Luj99
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(Original post by quraisht)
what about the left and the right ear??
I wasn't sure about that question , I just wrote destructive superposition occurred in right ear , what did you do for the last question
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FutureStripper
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(Original post by Luj99)
What I did for the last question was, I used my protractor to calculate the angle. the scale was (20 degrees in paper=40 degrees and then I converted using the value I calculated for the angle.After that I used the formula (μ1v1=μ2v2) to get the refractive index.the value I got was 1.12 I think
they literally said it is not to scale
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umang-23
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(Original post by Luj99)
I wasn't sure about that question , I just wrote destructive superposition occurred in right ear , what did you do for the last question
Whoa what? i talked about diffraction, wavelength, frequency and intensity. Why destructive superposition?
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Luj99
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(Original post by FutureStripper)
they literally said it is not to scale
What did you do for the question
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LittlePrince
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Mayn That Polarizing Filter We Had To Choose It was A Not B And Yeah Last Question Was Bad For Everyone I Think So!
Btw Was The Answer For SI Unit Ampere? and that charge was it 5.00 Coulomb? was the maximum displacement magnitude one amplitude? .
was the answer 3V for last question in MCQ's ?
i supposed 64 was the wavelength. And phase difference was somehow pie/2.it is wrong i think so....
In that intensity question i wrote about direct proportional to amplitude square and doppler effect. I hope its correct?
was the internal resistance 4.2? and emf 5.8? what was the power?
In the mean charge carriers were the electrons moving > or < ?.. i wrote > ...
I hope the grade boundaries are like 55 A something i hope so cause i will be losing atleast 25 marks maximum
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Luj99
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Does anyone know how to do the last question ?
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Jacopo Innocenzi
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(Original post by Luj99)
I wasn't sure about that question , I just wrote destructive superposition occurred in right ear , what did you do for the last question
WTF no you dont its all about diffraction i saw some people even write about doppler its clearly not that as the source is not moving.
Its all about diffraction
- Maximum diffration occurs when the gap size is equal to wavelenght
- when frequency increases wavelenght decreases this causes most of the sound to be reflected back while only some to be heard
- than you refer it back to intensity which is equal to power/area
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Jacopo Innocenzi
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(Original post by umang-23)
Whoa what? i talked about diffraction, wavelength, frequency and intensity. Why destructive superposition?
you are right dont panic the guy straight up guessed, it is obviously wrong
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Jacopo Innocenzi
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(Original post by LittlePrince)
Mayn That Polarizing Filter We Had To Choose It was A Not B And Yeah Last Question Was Bad For Everyone I Think So!
Btw Was The Answer For SI Unit Ampere? and that charge was it 5.00 Coulomb? was the maximum displacement magnitude one amplitude? .
was the answer 3V for last question in MCQ's ?
i supposed 64 was the wavelength. And phase difference was somehow pie/2.it is wrong i think so....
In that intensity question i wrote about direct proportional to amplitude square and doppler effect. I hope its correct?
was the internal resistance 4.2? and emf 5.8? what was the power?
In the mean charge carriers were the electrons moving > or < ?.. i wrote > ...
I hope the grade boundaries are like 55 A something i hope so cause i will be losing atleast 25 marks maximum
SERIOUSLY DOPPLER?????????? you know that only happens when the source is moving right anyhow everything else seems to be correct
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Bobby.12
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#15
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#15
(Original post by Luj99)
Does anyone know how to do the last question ?
I found angle of i as 20 degrees
Because you had been given 20 degrees at the top. Then you had 90 degrees so you subtract the total from 180 and get 70 degrees
Then from the normal it's 90 again so you do 90-70=20
Then use the refractive index of both materials
n=sin i/sin r
but again I'm not 100% sure that's just what I did
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Luj99
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(Original post by Jacopo Innocenzi)
SERIOUSLY DOPPLER?????????? you know that only happens when the source is moving right anyhow everything else seems to be correct
What did you do for the last question
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LittlePrince
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By it i mean i wrote like the frequency is less and from the graph that it is decreasing. i only wrote that it diffracts and spreads! with wavelength increasing and etc.
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Jacopo Innocenzi
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(Original post by Bobby.12)
I found angle of i as 20 degrees
Because you had been given 20 degrees at the top. Then you had 90 degrees so you subtract the total from 180 and get 70 degrees
Then from the normal it's 90 again so you do 90-70=20
Then use the refractive index of both materials
n=sin i/sin r
but again I'm not 100% sure that's just what I did
pretty much
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Jacopo Innocenzi
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(Original post by LittlePrince)
By it i mean i wrote like the frequency is less and from the graph that it is decreasing. i only wrote that it diffracts and spreads! with wavelength increasing and etc.
that would only get you 1 mark if your lucky
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Nuha.R
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(Original post by Bobby.12)
I found angle of i as 20 degrees
Because you had been given 20 degrees at the top. Then you had 90 degrees so you subtract the total from 180 and get 70 degrees
Then from the normal it's 90 again so you do 90-70=20
Then use the refractive index of both materials
n=sin i/sin r
but again I'm not 100% sure that's just what I did
Is this the right one ?? because i did the same....
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