Spectroscopy
Which of the following relationships between absorbance and %transmittance is incorrect?

A = log10 1 / T
All are correct
A = log10 100 / %T
A = 2 - log10 %T

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Spectroscopy
Why must the voltage supplied to a tungsten lamp be very stable?

All of these
Because if it wasn't, the lamp would bum out
Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage
Because the lamp will only function at a specific voltage

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Spectroscopy
Why is it generally preferable to use absorbance as a measure of absorption rather than % transmittance?

None of these
Because %T is dependant on the power of the incident radiation
Because absorbance is proportional to the concentration of the analyte, whereas %T is not
Because %T cannot be measured as accurately as absorbance

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