 #1
 92
 5
 Homework Statement:

https://pmt.physicsandmathstutor.com/download/Physics/Alevel/PastPapers/AQAOld/Unit5/June%202016%20QP%20%20Unit%2052A%20AQA%20Physics%20Alevel.pdf
question 4b
 Relevant Equations:

inverse sqaure law
intensity= power/ area ???
https://pmt.physicsandmathstutor.co...e 2016 MS  Unit 52A AQA Physics Alevel.pdf
One question on this the mark scheme seems to skip this step as the intensity is Power per unit area ,
when you make I sun = I quaser * 4*10^17 and you plug in the values for power per unit area would the 4 pies cancel each other out
so P/4pieD^2 = ( P*4*10^11/4pieD^2 ) * 4* 10^12 ?
one final question on this when using the intensity equation should i assume the distance from a point to the emitting source of radiation affected by the inverse square law is a giant circle essentially ? As they want the distance from earth to the quaser would that mean that the P/ 4pie D^2 value the D value is the distance of the two objects not the surface area of the star or object ?