(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The wavelength of an electron is 4.4 × 10−7 m.

How fast is it moving? The Planck’s con-

stant is 6.62607 × 10−34 J · s .

Answer in units of m/s.

013 (part 2 of 2) 10.0 points

If the electron has a speed of 9 × 106 m/s,

what is its wavelength?

Answer in units of m.

2. Relevant equations

Thats what I need help on.

3. The attempt at a solution

I tried E = hc / λ

Then E = 1/2mv^2

But that didnt work. Any ideas? Thanks

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# Homework Help: Finding Electron Speed and Wavelength

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