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October 22, 2014

Homework Help: physics

Posted by anna on Tuesday, June 29, 2010 at 12:08am.

A bothersome feature of many physical measurements is the presence of a background signal (commonly called "noise"). In Part 2.2.4 of the experiment, some light that reflects off the apparatus or from neighboring stations strikes the photometer even when the direct beam is blocked. In addition, due to electronic drifts, the photometer does not generally read 0.0 mV even in a dark room. It is necessary, therefore, to subtract off this background level from the data to obtain a valid measurement. Suppose the measured background level is 4.9 mV. A signal of 20.3 mV is measured at a distance of 29.5 mm and 17 mV is measured at 33 mm. Correct the data for background and normalize the data to the maximum value. What is the normalized corrected value at 33 mm?

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