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# CIE Physics Paper 51 watch

1. How did it go guys?

Everyone was arguing about what was the dependent and what was independent?
How did you guys measure the wavelength?
I feel so **** about the fact that I read 10^-6 in Q2 rather than 10^6. You think they give ecf for the rest of the answers? :/
2. I made the same mistake at first :/ don't worry! Hopefully they won't penalise you too much (I'll pray for you). I realized and went back to fix it, but almost ran out of time to complete the entire paper x_x
3. what were your answers approximately for the questions? and what method did you talk about for finding the wavelength?
4. I put my dependent as V and independent as wavelength. I used a CRO to measure wavelength (idk if that was correct) and a voltmeter and an ammeter to make sure current was constant. To vary the wavelenth i used LEDs of different visible light colours since each has it's particular wavelength.
For Q2 i cant remember exactly but my gradient was to the 10th power and my error was for the last part was 25% (then i got 15% when I recalculated and I was so confused but only had a minute left so...)
5. i think i got around 45% for the uncertainty. i wrote a note for the examiners that we can never truly be certain of anything in life because i thought it was too high lol
6. Lol! Haha I agree with you!! All of my friends had different uncertainties...
7. I messed it up with the dependent and independent variables in part 1 :/ I wrote V was the independent and used a CRO to measure the wavelength. Part 2 was ok for me My physics teacher said that it was a harder paper so hopefully the grade boundries will be lower this year!
8. Does a number like 0.0047 ring any bells to anyone?
9. (Original post by pencil-case)
Does a number like 0.0047 ring any bells to anyone?
Does to me
10. Annoying, but I think this was what question 1 was looking for. Determining Plank's constant using the gradient of the plotted graph

https://youtu.be/iGw_qjUT5DA?list=PL..._pEQWXXw1vY6J9

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