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If there is no kinetic energy, then the energy required to remove an electron from the metal is equal to the energy of the photon beam being directed at the metal. from there you use the equation E=hv to find the frequency, then c= (wavelength)(frequency) to find the greatest wavelength of light that can remove electrons from the metal.
to find the longest wavelength first you would have to find the frequency of the wave. You get that through E=hv. where v= E/h. Then you would plug v into the equation c=(wavelength)(v) and then solve for wavelength.
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