## Planck's Constant

H-Atom ($E_{n}=-\frac{hR}{n^{2}}$)

Posts: 64
Joined: Fri Sep 28, 2018 12:27 am

### Planck's Constant

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.

Kate Chow 4H
Posts: 61
Joined: Fri Sep 28, 2018 12:28 am

### Re: Planck's Constant

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.

Tyra Nguyen 4H
Posts: 74
Joined: Fri Sep 28, 2018 12:25 am

### Re: Planck's Constant

The only part where significant figures matter is the answer.

Jeremy_Guiman2E
Posts: 82
Joined: Fri Sep 28, 2018 12:29 am

### Re: Planck's Constant

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.

Nina Do 4L
Posts: 61
Joined: Fri Sep 28, 2018 12:27 am

### Re: Planck's Constant

In peer learning sessions, we use 6.626*10^-34.