OCR Physics A H556/02 Exploring Physics *Unofficial Mark Scheme*

there was only 1 gamma ray

What do people thing the grade boundaries will be?

i got 2.3 ohms for resistance. plus minus 0.1 uncertainty.
My current 0.037 A across that 33 ohm resistor as I did 2.7/73 ohms which was the total resistance in the circuit.
Also i got 2.4 x 10^-12 m for the wavelength of electron positron question.

Ahhh I thought that a positron and electron were Annhilating which usually produces 2 gamma rays. I wrongly then...

40A is a huge amount of current. I got 0.037A but can't remember what the circuit was and how I did it.

1)B
2)C
3)D
4)B
5)A
6)C
7)A
8)D
9)D
10)C
11)D
12)A
13)D
14)B
15)B
4.71X10^-7
0.780+-0.026
0.0818
1.3X10^-19
144.58X10^3
21.6
1500uF
0.248
0.1
1.213x10^-12
191 minutes
1.1MeV protons have 0 binding energy and there are 2 nucleons in the produced hydrogen so 2.2/2=1.1
analysing students findings
-Gradient triangle too small, he should use a bigger gradient triangle.
-uncertainties in measurements e.g ruler, ammeter, top pan balance
-Best fit and worst fit were not drawn.
Please reply with question numbers and more answers or edits so I can edit accordingly.

Think they're referring to the transformer current. You should have got 240V on the primary coil. P=VI so 24/240 gave 0.1 which makes sense as it was a step down. Think national grid. Current is always low. And I did get 0.037 for the other current question so I believe you are right there

What was the question about which had 21.6 as the answer?

I got 57 mins coz it said decrease by 30% rather than decrease to 30% so i did ln(0.7)/ lambda

Think they're referring to the transformer current. You should have got 240V on the primary coil. P=VI so 24/240 gave 0.1 which makes sense as it was a step down. Think national grid. Current is always low. And I did get 0.037 for the other current question so I believe you are right there

yeah sap434 i did the same. 57 mins

What was the question about which had 21.6 as the answer?

I got 57 mins coz it said decrease by 30% rather than decrease to 30% so i did ln(0.7)/ lambda

Wasn't that the permittivity one? I got 2.2*10^-11 for that, 26.1 is way too high, since free space is 8.85*10^-12 which would make the relative permittivity 2.44*10^12.

It definitely said 'decrease to 30%'

ah thats it, i got 26,100 somehow. It was femto metres (-15)

No it definitely 100% said decrease to 30% as I checked that like three times.

Thought it was pF (*10^-12 F)

nah it was fm