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

On part aii, can someone confirm to me that there is a mistake in the masses, and there is difference between what they say in the question, and what they use in the mark scheme, or am I going mad?







Posted from TSR Mobile

For turning points do we need to know about dipole detectors?

pg 8: https://e301d5e52e4368a053856306f6475860b017e094.googledrive.com/host/0B1ZiqBksUHNYemtzOWdnbGVnRVk/Textbooks-for-Options/D2%20Wave-Particle%20Duality.pdf

I don't think we need to know about them just making sure. They don't appear either on antonine physics or the cgp study guide (not the revision guide which is pretty much useless for turning points)

Note: Antonine physics explains polarisation of radio slightly differently: http://www.antonine-education.co.uk/Pages/Physics_5_Options/Turning_points/TP_03/turning_points_3.htm

The spark gap experiment was only to demonstrate the existence of radio waves (I think).
Metal sheet and concave metal (i.e. reflectors) were used to find their wavelength via the nodes of the stationary wave produced between the two reflectors.
Dipole detector is to show that they can be polarized.

No worries

If you are not already doing so, I highly recommend reading the official AQA notes found here under "textbook for options": http://www.physicsandmathstutor.com/physics-revision/aqa-unit-5/

The only think i can understand about those microscopes is that i cannot understand them lol


Posted from TSR Mobile

Can anyone send me a link to a unit 4 unofficial mark scheme?

Hahaha I reckon the examiner marking it didn't understand what the mark scheme showed


Posted from TSR Mobile

For some reason when I do these rearranging ln ones, the mark scheme puts the values seen in my brackets the other way round!? In this instance they had the same answer.... Now I don't know anything about maths I just learn the rearrangements for physics off by heart really... But I would assume that this make a difference!?

For some reason when I do these rearranging ln ones, the mark scheme puts the values seen in my brackets the other way round!? In this instance they had the same answer.... Now I don't know anything about maths I just learn the rearrangements for physics off by heart really... But I would assume that this make a difference!?

I'm after the answer to this too, so stupid that they basically just say 'diagram drawn correctly' for full marks...

I drew horizontal line from tip of object to lens line, then projected it back onto the focal point BEFORE the lens, then drew another line from tip of object to the point of intersection of the axes and drew the image where these two lines intersected, between -F and lens axis

I did it different, my line went to the focal point after the lens. I would think your way was right, because it's a diverging lens, but that would give a virtual image wouldn't it? The question asks for a real image




Posted from TSR Mobile

For some reason when I do these rearranging ln ones, the mark scheme puts the values seen in my brackets the other way round!? In this instance they had the same answer.... Now I don't know anything about maths I just learn the rearrangements for physics off by heart really... But I would assume that this make a difference!?