Edexcel AS Physics paper 2

It was a pretty good paper, I messed up the lenses question somehow and also the refraction

It was a pretty good paper, I messed up the lenses question somehow and also the refraction

It was a pretty good paper, I messed up the lenses question somehow and also the refraction

Also one thing I forgot to mention, did you understand the question asking you to draw a soundwave using the diagram? I didn't fully understand it so idk if I did it right or not, only 2 marks though

The exam was insanely easy, planning to get at least 90% for it. But refraction was weird, my class split in half, it's either 40 ot 68 degrees. But I got both answers in the exam and crossed 68, but now I think 40 is wrong

That's a question that never came up before, but my fabulous teacher taught us that at the begining of the year, It came up in IASL, but what you needed to do, is just see how much the point is away from its line and draw displacement graph, it looked like Sin graph, if you did it correct

ye I also got 40 degrees but there's no way it's equal to the angle of incidence of white light. I think 68 sounds more right. I think you had to do something with both the red and yellow rays of light maybe? Since it isn't monochromatic light incident maybe that changes how you work it out? Kinda like in section B with the momentum question, the particles don't move off combined which is different from the typical question of particles moving off together after colliding. Praying that 40 degrees is correct because of so, I have no worries whatsoever

Ahh I thought so, I kind of did something along those lines, but I got confused with the vertical dotted lines being on the actual graph with the dots representing the particles - luckily it was only 2 marks. Sounds like your teacher came in clutch lmao 😂, good luck with results everyone.

It was a pretty good paper, I messed up the lenses question somehow and also the refraction

I know how to get 68 and I'm pretty sure it is right. To get 68 you have to get the incident angle on the second wall (inside the prism) you can use that angle at the top (60°). Why i think is right? Because we use that angle at the top. If you get 40 you didn't use that angle. Then why would it be there. Also I did that and it looked correct, cause I did this question both ways, but my dumb ass just decided to measure the angle with protractor and it was 39° so I thought that 40° makes more sense

Ye that's what i'm saying, I agree with you. The way I got 40 degrees is because the light ray and that 60 degree corner form a triangle of their own so then 180-60-24 (24 being the 1st refracted angle) gives you the supposed angle of incidence and from there you use snell's law and get exactly 40 degrees. But like you said, 68 definitely seems more believable especially considering the 40 degree answer is exact so it's almost like i've done a loop just leading back to the original angle of incidence given.

Waaaaait. Did you use that 60 at the top to get 40? Cause I just used 24. We'll if you did use 60 at the top and got 40, that might be correct tho

I'll be honest, I don't remember which angle I used to find the angle of refraction exiting but I remember forming a triangle with the red light ray and the 60 degree angle and then finding the bottom right corner of it next to where the rays exist. I'll ask a physics teacher tomorrow to see what he thinks as I think I can recall the question mostly. I may have done 180- the bottom right corner angle so that it's the normal to the surface but i'm not entirely certain.

Well, that's fair enough if you have used that 60 at the top. I feel like getting either 40 or 68 will give you at least 3 out of 4( or was it out of 5?). Also, I've done the paper 20 mins before the end, and all of that time, I was doing the show that question about mew the m over L one. But it was actually easy, but I was just using wrong formulas for volume 😭

ye either way we'll get 2-3 marks if we're wrong. Is that the graph question where we had to show that the students model was appropriate or something? Ye it happens, that was me in paper 1 😅

Oh, also. There was a graph, and we got a formula for the graph, and we needed to calculate the gradient at the really beginning. I got 75 for the gradient and 0.75 from the formula. Does that support students' evidence or not? It was q9 about polarizing filter part b

Ahh yes, that's the one I thought you were on about. Icl I thought I hadn't converted some units because they're 100x apart but maybe not since you got that too. I just wrote that it does support it but I can't remember the question exactly and can't think it over - I just guessed

I've checked the units and didn't get why is it a multiple of 100, so I also said it supports and that's it. But this paper overall was literally a gift and saved me from paper 1. As paper 1 was insanely compare to this