Up to what value of coherence time in cognitive radio is considered
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Red is of long wave length so its energ is low,it is not enough to overcome the work function ( W) that binds electron to matter.Remember the equation KE=hf=hc/L -W, where KE ejected electron kinetic energy,hc/L is red light energy,L is its wave length, c the speed of light and h is Planck constant.
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