Maximum speed of emitted electrons is [tex]5.09 * 10^{-19} m/s[/tex] and work function is [tex]1.4 * 10^{-19} eV[/tex].
We know that maximum speed of emitted electrons is given by: [tex]\frac{hc}{\alpha }[/tex]
where, h = planck's constant = [tex]6.62 * 10^{-34}[/tex]
c = speed of light = [tex]3 * 10^{8} m/s[/tex]
[tex]\alpha[/tex] = wavelength = 390 nm = [tex]3.9 * 10^{-9} m[/tex]
Putting these values in above equation we get E = [tex]5.09 * 10^{-19} m/s[/tex]
Also work function is given by: W = eV
where, W = work function
e = charge of electron = [tex]1.6 * 10^{-19} C[/tex]
V = stopping potential = 0.888v
Putting these values in above equation we get W = eV = [tex]1.4 * 10^{-19} eV[/tex]
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