AQA A-level Physics Paper 3 (7408/3) - 15th June 2023 [Exam Chat]

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Reply 80

moonlight2460

Original post by yr16ISpence

anyone got the equations we need to know for turning points that isnt on the formula sheet?

Don't but ik there's fizeau's equation and proving specific charge using one of the methods

Reply 81

andysuis

Does anyone have pdf of paper 3A and turning points paper 2022?

Reply 82

resonatethesoup

anyone kno for astrophysics whether you have to memorise the different spectral classes?

Reply 83

_gracccc

Original post by resonatethesoup

anyone kno for astrophysics whether you have to memorise the different spectral classes?

you do, you need to memorise their order, their temperatures and their prominent spectral lines

Reply 84

resonatethesoup

Original post by _gracccc

you do, you need to memorise their order, their temperatures and their prominent spectral lines

thats intense, thanks

Reply 85

lakshinator

why? sorry I don't get it

Original post by Tigershortfoot

You've found your minimum angular resolution, now set up a right angled triangle with half the diameter of the crater on the opposite side and the distance to the crater from the spacecraft on the adjacent side and see if the angle*2 is greater or less that your angle. If it is greater that means that you can study it, if the angle is less you cannot

Reply 86

Abdullah05

Original post by lakshinator

why? sorry I don't get it

im pretty sure it was wrong tbh.

Reply 87

olimoore1232

Original post by lakshinator

why? sorry I don't get it

Just times the minimum angular resolution by the distance to Pluto or whatever it was and that will tell you the smallest thing you can see on Pluto. This comes out at like 20 something metres and the crator is much bigger so it’s appropriate. (Make sure to use values in your answer tho)

the other way he is talking about which you can do is drawing out a right angled triangle which goes from the space shuttle to Pluto, (try drawing this horizontal) the line which goes horizontal is the distance between the two and the line which goes vertical is diameter of Pluto. Using trig we can get tan(theta) = diameter/distance and using small angle approximation we get theta = diameter / distance. If you plug in the values with that equation you get a value of angle which is higher than the minimum angular resolution which you initially worked out which means that you WILL be able to observe it and it will be appropriate. (Harder way tho)

Reply 88

olimoore1232

sorry didn’t explain the why very well. if the angle was below the minimum angle of resolution then it would not be able to be distinguished on the telescope