1. the absorbance formula is A=lgI0/I=-lgT, where a is absorbance, t is transmittance, I0 is incident light intensity, and I is transmitted light intensity.
Absorbance is a term in physics and chemistry, which refers to the logarithm of 10 (i.e. LG (I0/I 1)) of the ratio of incident light intensity before light passes through a solution or substance to transmitted light intensity after light passes through a solution or substance (I0/i1), where i0 is incident light intensity and I65438+).
The absorption coefficient is related to the wavelength of incident light and the substance through which the light passes. As long as the wavelength of light is fixed, the absorption coefficient of the same substance remains unchanged.
When a beam of light passes through a light-absorbing substance (usually a solution), the solute absorbs light energy and the light intensity decreases. Absorbance is a physical quantity used to measure the degree of light absorption.
Second, the calculation formula of wavelength: λ = ut. Wavelength refers to the distance that a wave travels in a vibration period. That is, the distance between two adjacent points with a phase difference of 2π along the propagation direction of waves. The wavelength λ is equal to the product of the wave velocity u and the period t, that is, λ=uT. Waves with the same frequency travel at different speeds in different media, so their wavelengths are different.
Wavelength refers to the displacement between two relative equilibrium positions in the wave pattern along the propagation direction of the wave. The wavelengths of shear wave and longitudinal wave represent different meanings. In shear waves, wavelength refers to the distance between two adjacent points with different phases, usually adjacent peaks, valleys or corresponding zero crossings. In longitudinal waves, wavelength refers to the distance between two adjacent dense or sparse parts. In physics, wavelength is often expressed as λ and the international unit is meter (m).