Question

A coloured solution is placed within a spectrometer. At 554 nm the solution shows an absorbance of 0.69. Calculate the percentage of light that is being absorbed.

Answer 1

Wavelength, $\lambda=554nm,λ=554nm, Absorbance = 0.69=0.69$

The relation between Absorbance and transmittance is-

$A=-log(\dfrac{T}{100}) \\[9pt] 0.69=-log(\dfrac{T}{100}) \\[9pt] \dfrac{T}{1000}=10^{-0.69}$

$T=0.2041\times 100=20.41$ %

Percentage of light absorbed

$= 100-T=100-20.41=79.59$ %