an imaginary line paralleling the equator where a magnetic needle has no dip

an imaginary line paralleling the equator where a magnetic needle has no dip

the efficiency with which electromagnetic radiation produces a photochemical reaction plotted as a function of the wavelength of the radiation

the spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths

the spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths

a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber

a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber

a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber

a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber

a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber