QUESTION 2 2 points Save Ans Instruments) is a local instrument manufacturer sta
ID: 2073935 • Letter: Q
Question
QUESTION 2 2 points Save Ans Instruments) is a local instrument manufacturer started by one of Dr. Blades' graduate students. They specialize in Atomic Absorption spectromes but also make UV/Vis spectrophotometers You've just been hired by Aurora as an instrument designer, to help with their new double-beam UV/Mis instrument development. The design is going to use an 8-blade mirrored chopper to alternmately direct the light through the reference and sample. They are having trouble choosing a chopper frequency that provides them the best sign to-noise ratio, (ie, the least interference). The chopper motor is capable of operating from 4.0 to 4000 rpm What rotation rate should be chosen? a-0.393 rad/s b. 43.19 rad/s .47.12 rad/s d. 141.37 rads e.785.398 rad/s f. 23.56 rad/sExplanation / Answer
chopping speed (Hz0 = external voltage x slots in the disc x 49.44
if the external votage say 2.5 volts , slotes = 8 ,
them the chopping speed = 2.5 x 8 x 49.44 = 988 Hz.
as angular speed = Hz / 6.78 = 988/6.78 = 145.84 rad/sec.
Approximately it can be said that the option of "d" . ie. 141.37 rad/sec can be choosen.