AQA Physics PHYA5 - Thursday 18th June 2015 [Exam Discussion Thread]

does anyone have a list of all the keywords and their definitions that we need for nuclear&thermal section

Electrons behave like waves with a de Broglie wavelength - this minimum represents where destructive interference first takes place where beams superpose on top of one another (see unit 2 notes). All you need to know is that the first minimum is where $\sin \theta = \frac{1.22 \lambda}{D}$.


Posted from TSR Mobile

Hi guys, I'm a private candidate and have been studying from home. I've learned the whole Unit 5 syllabus and have practiced all the past paper exams because I'm not quite sure which papers I'm supposed to take and why there are so many?:| If anyone could steer me in the right direction, that would be great because I think I've probably covered more than I needed to?

This doesn't sound good. When you went to apply to take the unit 5 exam did you not specify which optional topic you would be doing? Considering there's two parts to Unit 5.

Does anyone know why during electron diffraction the deflection is purely down to diffraction and not the positively charged nuclei affecting the paths of the electrons?

No you get given all the papers I think.

We will most certainly be getting the replacement paper

Electrons behave like waves with a de Broglie wavelength - this minimum represents where destructive interference first takes place where beams superpose on top of one another (see unit 2 notes). All you need to know is that the first minimum is where $\sin \theta = \frac{1.22 \lambda}{D}$.


Posted from TSR Mobile

Why is it 1.22? I've been trying to google this and can't find anything on it.

Anyone else think the grade boundaries will increase this year? Last year they were so low lol

Posted from TSR Mobile

Hey, would anyone be able to post how to derive the kinetic theory model as how they would want you write it in an answer? I just want to learn it so I can nail it if it comes up - sorry for the re-post