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

How was the exam guys? I found it quite easy.

what about the left and the right ear??

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

I wasn't sure about that question , I just wrote destructive superposition occurred in right ear , what did you do for the last question

they literally said it is not to scale

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?

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

Does anyone know how to do the last question ?

SERIOUSLY DOPPLER?????????? you know that only happens when the source is moving right anyhow everything else seems to be correct

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

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.

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