[jtlbb2]

Okay, need help with a homework assignment.

"An electron moves with a velocity of 2.5 * 10^8 cm *s^(-1).  What is its wavelength?"

I think I am supposed to use this equation to sove this problem: h/mv.

But the problem is, this is all the information this question gives.  It doesn't give the mass, so I dont' know what to do.  I've tried using the equation c = (wavelength)(frequency), but that didn't work out.

Can anyone help?

[Borek]

It doesn't give the mass, so I dont' know what to do.

Check the mass of electron in your textbook.

[jtlbb2]

Thanks for the help.  I couldn't find the mass of an electron in my book, but I was able to find it by googling it.  And I used that, and I got the right answer.  I guess the authors just assumed that I would know that bit of info or something.

[jtlbb2]

Got another question, but I don't want to just keep creating new topics...

But when n= 4, l = 2, and ml = -1, is this just written as 4d?

Also, if you had n = 5, how come we don't implement a g subshell?

[Donaldson Tan]

use debroglie's equation to solve your problem:


Will electrons fill the 5g shell? I am sure you would have observed that even the 3d shell is only filled in period 4 elements.