Official OCR New Spec AS Level Physics: Depth in physics - 9th of May

I belive I got 5.6 x 10^3, and 0.100 for the bit about finding the resistivity...? Did you get something similar for that?

For the breaking stress i talked about measuring stress and strain and when the wire broke i would read off the stress/streain graph to find a value for breaking stress. Bc breaking stress is just force over area. Is this right

Threshold frequency; so it showed that it was a particle as there is no way of explaining this phenomena with the wave like nature of EM radiation. Also explained it talking about how if it was explainable using the wavelike nature then continuous energy stored would eventually lead to electron emission and so the leaf would fall, but obviously it didn't. Also talked about how the intensity doesn't affect the time taken for the radiation below the threshold frequency showing the previous contradiction. Then I said that the fact that the leaf falls faster when intensity increases for uv shows the particulate nature as it means there are more photons per m^2 and so more photons for the one-to-one ratio >>>electrons escape faster so it falls faster.

I also said that for white light the violet end of the spectrum could have enough energy to cause electron emission bc there gold leaf still fell really slowly. Is his right.

I belive I got 5.6 x 10^3, and 0.100 for the bit about finding the resistivity...? Did you get something similar for that?

i got 0.112

I belive I got 5.6 x 10^3, and 0.100 for the bit about finding the resistivity...? Did you get something similar for that?

I got this.
I got 5800 for the gradient and 0.11 for the resistivity.
For the gradient, were we meant to write it in standard form on the answer line?

Are these roughly the correct answers?

Yeah; I don't think you have to include the strain bit because it was only about the breaking stress. I just said use the pulley system one; and then measure the diameter multiple times with a micrometer; take an average and use A=πd^2/4 for the cross sectional area; and then do the same for the mass x 9.81 where the wire began to neck/ about to break and do this multiple times and take an average. Then do F/A=breaking stress.

How many marks was this?