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# Edexcel IAL Physics Unit 03 WPH03 - 10th of May, 2017 watch

1. (Original post by examhater44)
I kept my percentage uncertainty as 1.67% i didnt round it off to 1.7% i would still get the mark right?
Yeh that's rounded to 3sf so you'd be fine
2. I doubt it, sorry!

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3. i think they allow 2.s.f. / 3.s.f .... if they see your previous working out and the method you have done.. i think they can award marks!!
Percentage uncertainty was 1.7%
I got same
5. (Original post by inshaa)
i lost my 2 marks there... i talked about the wave being hit on a barrier so it traveled a distance L a the reflected wave travels back giving a total distance of 2L
wait I wrote the same , is it wrong ??
6. What did the diagram look like for the circuit to find the resistance of a filament lamp?
7. (Original post by Droneon)
The burns occurred at the antinodes so distance between adjacent antinodes is half lamda. Therefore twice d is lamda.

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wait how did u know that burns occur at anti node? didnt they say that the wavelength of the microwave is equal to twice the distance between the burn marks so isnt it suppose to be like lambda= 2 x length ?
8. (Original post by christos123456)
What did the diagram look like for the circuit to find the resistance of a filament lamp?
Idk if correct but I included a bulb , an ammeter, a voltmeter a battery and a variable resistor
what did u put ?
9. Because at anti nodes constructive interference occurs, causing the burn marks. Nodes have no energy
10. hey could we use vernier callipers for finding the distance between burn marks?
11. (Original post by ashmjj)
hey could we use vernier callipers for finding the distance between burn marks?
can we say like a normal ruler with a precision of 0.1 cm ??
12. (Original post by shahida sulaiman)
can we say like a normal ruler with a precision of 0.1 cm ??
i think u can i mean why not meter rule can be used to find that distance just that it's not that precise as vernier!
13. (Original post by ashmjj)
i think u can i mean why not meter rule can be used to find that distance just that it's not that precise as vernier!
but they didnt say anything about the instrument ,they say like the instrument u would use and the choice of instrument , they didnt say anything about it being precise right ?
14. I got the same!

(Original post by shahida sulaiman)
Idk if correct but I included a bulb , an ammeter, a voltmeter a battery and a variable resistor
what did u put ?
15. (Original post by shahida sulaiman)
but they didnt say anything about the instrument ,they say like the instrument u would use and the choice of instrument , they didnt say anything about it being precise right ?
yep they dint! DW meter rule scores the marks
16. (Original post by ashmjj)
yep they dint! DW meter rule scores the marks
yeah thats the problem I just wrote a ruler with 0.1 cm precision , I think thats wrong
17. (Original post by christos123456)
I got the same!
do they like give zero if we convert like mm to m or MHz to Hz wrong ?

(Original post by ashmjj)
yep they dint! DW meter rule scores the marks
18. I don't think so, I put ruler to be safe
19. (Original post by shahida sulaiman)
yeah thats the problem I just wrote a ruler with 0.1 cm precision , I think thats wrong
Why do you think it's wrong?
20. (Original post by FutureStripper)
Why do you think it's wrong?
because of the precision and mostly people wrote meter rule not ruler

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