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# Edexcel physics unit 6B (15 May 2014) watch

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1. I don't know how, but I managed to get 1.87x10^-35 as value of h, for some reason I used 1,20x10^-21 instead of my answer for k (1,20x10^-18) because of that I also got like 95% percentage difference between h and my value, so I knew something was wrong but I didn't notice the power mistake I've done in calculating my h. I hope they won't punish me too much for that that would already take like 5 marks away
2. (Original post by Cemao)
I got k=1200!!! God! I'll lost all the marks in this question?!
i got that too at first, but you forgot to change the units! lambda was given in x10*-12m and since it asked you to do lambda*-2, the units changed to x10*24, also you forgot to change kilovolts into volts. nevertheless it must be your lucky day because all the following questions stated 'using your answer' which means you have only lost 4 marks max ( hope that somehow makes you feel better...)
3. (Original post by NilFBosh)
What did you guys get for % uncertainty of k?

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i got 4.9% and in the next (uncertainty for h, i got half of it = 2.5%)

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