Aurora Biomed is a local instrument manufacturer started by one of Dr. Blades\'

Question

Aurora Biomed is a local instrument manufacturer started by one of Dr. Blades' graduate students. They specialize in Atomic Absorption spectrometers, but also make UV/Vis spectrophotometers. You've just been hired by Aurora as a junior applications engineer to help with their new double-beam UV/Vis instrument development. The design is going to use a 4-sectioned mirrored chopper to alternatively direct the light through the reference and sample. They are having trouble choosing a chopper frequency that provides the best signal-to-noise ratio (i.e., the least interference). The chopper motor is capable of operating from 500 to 2000 rpm. What chopper rotation rate should be chosen? Show your work. a. 43.19 rad/s b. 47.12 rad/s c. 78.54 rad/s d. 314.16 rad/s e. 94.24 rad/s f. 376.99 rad/s

Explanation / Answer

step;2

the frequency f1=500 rpm

frequency f2=2000 rpm

step;2

now we find the angular velocity

the angular velocity W=2*3.14(f2-f1)

=23*3.14*(2000-500)

=9420 rpm

=154 rad/s   

but her the chopper angular velocity w=w/2=154/2=78.54 rad/s

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