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purecp
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Homework Statement
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.
Homework Equations
Thats what I need help on.
The Attempt at a Solution
I tried E = hc / λ
Then E = 1/2mv^2
But that didnt work. Any ideas? Thanks