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Homework Statement
The X-ray intensity distribution function for an X-ray lamp is
given on the figure. What is the maximum velocity of the electrons? What is the potential difference under which the lamp is operating? Figure: http://imgur.com/01kCBc8
Homework Equations
Kmax = 0.5m(vmax)^2
Kmax = hf - work function
λ = c/f
c = speed of light = 3 x 10^8 m/s
Peak wavelength (from the figure) = 3.5 x 10^-9 m
h = Planck's constant = 6.63 x 10^-34
m = mass of electron = 9.11 x 10^-31
The Attempt at a Solution
Doubt I'm starting at the right place.
0.5mv^2 = hf (work function??)
0.5mv^2 = h(c/λ)
v = sqrt [2h(c/λ)/m]
v = 1.1 x 10^7 m/s
Given answer is 1.5 x 10^7 m/s
As for the potential difference, I have no idea how to calculate it.
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