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Planck's Constant

Posted: Tue Oct 16, 2018 3:42 pm
When we're using Planck's constant, do we use 6.626 X 10^-34 or 6.63 X 10^-34? Professor switches off between the two in the lecture notes.

Re: Planck's Constant

Posted: Tue Oct 16, 2018 3:47 pm
It doesn't matter because the only difference between 6.626 X 10^-34 and 6.63 X 10^-34 is the number of significant figures. I would use 6.626 X 10^-34, as more significant figures will usually lead to a more accurate answer in the end.

Re: Planck's Constant

Posted: Tue Oct 16, 2018 4:25 pm
The only part where significant figures matter is the answer.

Re: Planck's Constant

Posted: Tue Oct 16, 2018 4:28 pm
I believe he uses 6.63 X 10-34 when there are only a maximum of three significant figures are given. Otherwise, if given four or more, he will use 6.626 X 10-34.

Regardless, I would agree though that using 6.626 X 10-34 consistently will give the most accurate results.

Re: Planck's Constant

Posted: Wed Oct 17, 2018 3:19 pm
In peer learning sessions, we use 6.626*10^-34.