Edexcel A level Physics Paper 2 (New Spec) - 21st June

was the astronomical distance question c, How to find distance not using standard candles or using standard candles?

I think it was how to find it using standard candles

I think it was how not to

I thought the last two questions were quite challenging... didn't get enough time to do them

was it just me, or was question 19 b i out by a factor of 10? i got 2.4x10¹⁷ consistently where it wanted ≈3x10¹⁸

Agreed, neither did I

can anyone remember what their answer was for the efficiency of the Geiger-Muller counter?

I got 70. Sth

can anyone remember what their answer was for the efficiency of the Geiger-Muller counter?

I Got 14.7% but I'm pretty sure that's wrong

The GM tube was about 0.84% I think, the cornea was 70.3% of the eye's power, angle was 10.8, roughly 13 day orbital period for the black holes, and the change in length of the arm was 0.005 times the diameter of the proton (so same order of magnitude as 0.001, but 5x larger)