AQA Physics Unit 1 PHYA1 20th May 2013

Original post by Qari

How much marks do you think I'd lose if I didn't do to it right signifacnt figures even though it don't tell you to?

None. General said you are only assessed one 1 question on sf.

Reply 1402

Pataiiii

Original post by StalkeR47

Exactly mate! I am also unsure. But I think it said decreased.... Which simply means emitted electrons will have less kinetic energy. :rolleyes:

Dam, i just lost two marks :/ i could have sworn that it said increased.

Reply 1403

CR95

Original post by Khenir

I had 16 since:

8 vertical divisions,
Peak to Peak = 128V
so (128/8) = Y-sensitivity = 16.

Yeah but all of us that put 20 new that 16 would get the 'largest oscillation display' but we picked 20 as it is a more suitable/ sensible scale. Its the way on isa's you aren't allowed to go up in multiples of 3.

Reply 1404

Original post by StalkeR47

Actually I saw 16 in your answer and ignored the rest. I said change the time base until 16 division on the x-axis appears since 8 division was for 1 wave cycle. So I did not get same as you :tongue:

It wasn't my answer, I'm just saying it asked to see 2 full waves and you had to change x-div for that

Reply 1405

mahatma ghandi

1

Original post by GeneralOJB

For the current it was 6.67x10^-5
The voltage on the meter was 0.33V
Last 2 are correct.

ok cheers for feedback

Reply 1406

I got LDR wrong, so 2 marks deffo lost there. I though Resistance increases with light :frown:

Reply 1407

Original post by Pataiiii

Dam, i just lost two marks :/ i could have sworn that it said increased.

Know what? After when I finished the exam, I thought it was increase question... but I was confused. I just remember now that it was decrease question and I actually did correct. I am sure you also talked about what happens when the frequency is decreased. :smile:

Reply 1408

Are you on about the photoelectric question? That said decrease

Reply 1409

AP41

For the work function question, did anyone else when they converted the 1.8Ev into Joules get 2.88*10-19 but when they then worked out the work function using the formula got 2.89*10-19 Joules, or was it only me? :P

Reply 1410

Abbseh

2

Original post by StalkeR47

Normally it is 54-56 out of 70 for an A. :biggrin:

Okay good, thank you! :biggrin:

You wouldn't happen to know what 90ums is normally would you? I know it changes a fair bit :smile:

Reply 1411

Original post by Qari

Are you on about the photoelectric question? That said decrease

yes.

Reply 1412

TheSnail

17

Original post by GeneralOJB

I don't think so.

The mark scheme says:
"All other numerical answers should not be considered in terms of significant figures."
"Numerical answers presented in non-standard form are undesirable but should not be penalised."

Thank you!!

This was posted from The Student Room's iPhone/iPad App

Reply 1413

Original post by AP41

For the work function question, did anyone else when they converted the 1.8Ev into Joules get 2.88*10-19 but when they then worked out the work function using the formula got 2.89*10-19 Joules, or was it only me? :P

Yeah I got that, but I think they'll allow you to use your answer from previous question :smile:

Reply 1414

Goods

16

Original post by CR95

Yeah but all of us that put 20 new that 16 would get the 'largest oscillation display' but we picked 20 as it is a more suitable/ sensible scale. Its the way on isa's you aren't allowed to go up in multiples of 3.

I left 20 because it asked how i would adjust it, and i wouldn't have adjusted the y sensitivity. I doubt it will lose a mark so long as you mentioned that you would leave/set it at 20

Reply 1415

Original post by AP41

For the work function question, did anyone else when they converted the 1.8Ev into Joules get 2.88*10-19 but when they then worked out the work function using the formula got 2.89*10-19 Joules, or was it only me? :P

work function should be calculated in joules otherwise stated in the question.

Reply 1416

Original post by Abbseh

Okay good, thank you! :biggrin:

You wouldn't happen to know what 90ums is normally would you? I know it changes a fair bit :smile:

Well no. But I hope you get what you want. Amen.

Reply 1417

tetra-s

for the plot the rms voltage on the graph..did you have to plot it when the voltage was negative also? seems it would be the case as it was worth 2 marks..forgot to do it lol oops

Reply 1418