Did people get 7.42V or something for that question about... I can't remember I think it was a potential divider. And for that one about minimum pulse duration did you do 200km/3x10^8ms^-1. Also for the last question I got 2.94x10^8 therefore experiment was accurate.

Reply 968

MO2898

7

Original post by katieskiier

ahhhhh noooooo that's so annoying! I swear I haven't got a single question completely right!

Debatable, I also wrote there may be other components such as LED or speaker. Thing is the question was talking about useful THERMAL energy so I guess anything outside that can be classed as not useful. I also wrote that the kettle body itself heats up and that heat gets dissipated to the surroundings.

But we should get both points for that, hopefully. :smile:

Reply 969

André3000

Just a small point, not really fussed it was only 1 mark, what did we put for the photoelectron question where it asked about what made up the difference?

Reply 970

bob wayne

Original post by kcorbins

Did people get 7.42V or something for that question about... I can't remember I think it was a potential divider. And for that one about minimum pulse duration did you do 200km/3x10^8ms^-1. Also for the last question I got 2.94x10^8 therefore experiment was accurate.

I think my voltage answer was 7.42V or near that and yes i got 2.94x10^8ms-1 that was a nice 3 mark question. I couldn't prove the area was 2x10^-7m though

Reply 971

Kaneda

9

Original post by bob wayne

I think my voltage answer was 7.42V or near that and yes i got 2.94x10^8ms-1 that was a nice 3 mark question. I couldn't prove the area was 2x10^-7m though

For the area I first tried 1mm because the diameter if the coil was exactly 1mm :s but after using that value it gave me a larger value than the show that value so I was sneaky and worked backwards from the show that value XD

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Reply 972

DrFrench

Now the embargo is ended Questions and Possible Answers are here....
https://www.youtube.com/watch?v=2xF9AIR3H-4

Reply 973

EleanorParker

Is there an unofficial markscheme coming out soon anywhere?

Reply 974

pinkgorilla

5

Someone start an unofficial mark scheme ?

Reply 975

Regina15

2

Original post by jamez870

Yeah I put kinetic energy in joules, I think they're correct

For that question, I said stopping voltage, would that be okay? There's a graph of stopping voltage against frequency in the book

Reply 976

Regina15

2

Original post by André3000

I got around 8 volts ish, but then i didnt bother to check which bit they wanted. I reckon it's right though!

I got 8.2 V :smile:

Reply 977

B-Stacks

13

Original post by pinkgorilla

Someone start an unofficial mark scheme ?

Original post by EleanorParker

Is there an unofficial markscheme coming out soon anywhere?

Look at the YouTube link posted above

Reply 978

jay_em

2

Original post by André3000

Just a small point, not really fussed it was only 1 mark, what did we put for the photoelectron question where it asked about what made up the difference?