The velocity of electrons (question)

[evanallmighty]

The velocity of electrons! (question)

Can someone tell me if I'm right? I used this walkthrough I found to get my answer but I used a different wavelength for my experiment. Here's the link:
http://wiki.answers.com/Q/What_is_th...ength_of_235nm

I did the same thing except I used a wavelength of 400 nm and my answer was 2038 m/s. This is one of my first problems with this and I was just curious if anyone could comfirn this answer or if I failed horribly.

Thanks.

 

[granpa]

http://www.wolframalpha.com/input/?i=speed+of+electron+with+De+Broglie+wavelength+of+235nm

 

[evanallmighty]

Thanks that helped out a lot. Is 220 a big difference when measuring velocity? Becuase my answer was off by 220. (meters per second)

_evanallmighty