Consider a situation where 100 photons of light pass through a sample. After the
ID: 902368 • Letter: C
Question
Consider a situation where 100 photons of light pass through a sample. After the light passes through the sample, 10 photons are detected.
A) How many photons were transmitted throught the sample?
B) Calculate the % of photons transmitted ans the % of protons absorbed
C) Use the equation aboce to calulate the absorbance of the solution from the % transmittance
D) Calculate the absorance of a solution in which 20 of the 100 photons are detected
E) Compare the ratio of the % photons absorbed to the ratio of their absorbance values
Explanation / Answer
A) Transmittance, T = P / P0
T = 10 / 100 = 0.1
B) % Transmittance, %T = 100 T = 100x 0.1 = 10 %
C) A = 2 - log10 %T
A= 2- log 10= 2-1 =1
D) T = 20/100 = 0.2
%T = 100 T = 0.2x100= 20%
A= 2- log 20 = 2 -1.301 = 0.699
E) % photons absorbed = 90% &80%
ratio to absorbance values= 90/1= 90
80/0.699=114.449