If the transmittance of a substance was determined as 20% what is the absorbance? Question 46Select one: a. 0.3 b. 1.633 c. 0.1 d. 0.7 e. none of the other choices is true
Question
If the transmittance of a substance was determined as 20% what is the absorbance? Question 46Select one:
a. 0.3
b. 1.633
c. 0.1
d. 0.7
e. none of the other choices is true
Solution
The absorbance of a substance can be calculated from its transmittance using the formula:
A = -log10(T)
where: A is the absorbance, T is the transmittance (expressed as a decimal, not a percentage).
Given that the transmittance of the substance is 20%, we first need to convert this to a decimal:
T = 20/100 = 0.2
Then we can substitute this into the formula to find the absorbance:
A = -log10(0.2) = 0.699
So, the absorbance of the substance is approximately 0.7. Therefore, the correct answer is:
d. 0.7
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