- #1
HawkBear05
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Homework Statement
What is the cutt off wavelength of the material, and max nrg of electrons when we know the stop potent. of the material is 8 V and the wavelegnth is 100 nm. What is stop potent. of material when wavelegthn is 200 nm?
Homework Equations
E = hv - w
where E = hv
and h = planks constant or "h cross"
The Attempt at a Solution
hv = hv - w = E
8 = h (c/wavelegthn) - w
8 = 6.6* 10 ^-34 (3*10^8/100) - w
solved for w... but how do I find cut off nm? and max nrg of electron
at 200 nm...
E = h (c/wavelegthn) - w
E = 6.6* 10 ^-34 (3*10^8 / 200) - 0
solved for E, but I pretty sure its wrong.