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absorbed absorption acting light Ag+ ion agreement approximation assume atoms Becquerel effect blue light cause cell chlorophyll colour conduction band connected considered constant intensity corresponding critical frequency decrease deduced density production depends developed density deviations differential law direct density discussion efficiency electron energy experimental experiments exposure function galvanometer given density Gurney-Mott theory H. B. G. Casimir Herschel effect increase independent integral interlattice intermittency effect interquantum interval irradiation Jurriens Kreveld Kreveld's law latent image formation light intensity log Q low intensities mean measuring light method milk glass mixture neutralized observed obtained optimal intensity optimum order of magnitude photoconduction photographic plate plot print-out probability processes quantities quantum r.l.f. curves radiation radiobiology reciprocity law failure red light region relaxation remarks root mean square S-shape saturation sensitivity specks Silberstein and Webb silver similar strip temperature theoretical threshold unit of action wave lengths Webb's yields