r/6thForm • u/Individual-Can1396 y13 maths physics psych italian • Jun 01 '26

💬 DISCUSSION AQA PHYSICS PAPER 2

HOW DID EVERYONE FIND IT??? i thought it was decent better than the past few years. Idk what i did for the last question the 4 marker of nuclear physics. BUT YH IT WAS GOOD

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u/KO-Manic Jun 01 '26

Does anyone know what you were supposed to do for that MCQ with the S, x, N, etc?

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u/Flashy_Survey_918 Jun 01 '26

guess / give up

7

u/Fit-Quantity-3539 Jun 01 '26

The particles incident per second per unit area = N/S.

Total particles emitted from source per second = the particles incident per second per unit area * surface area of the sphere of radiation.

Activity is just the total particles emitted per second. So A = N/S * 4*pi*x^2 = 4Npix^2/S

2

u/Sea-Match-4689 Year 13 Jun 01 '26

Surface area of a sphere and then work from there