February 25, 2017

Homework Help: Physics

Posted by Marissa on Thursday, October 8, 2009 at 10:03pm.

A bothersome feature of many physical measurements is the presence of a background signal (commonly called "noise"). It is necessary, therefore, to subtract off this background level from the data to obtain a valid measurement. Suppose the measured background level is 4.7 mV. A signal of 20.1 mV is measured at a distance of 28 mm and 15.3 mV is measured at 33.5 mm. Correct the data for background and normalize the data to the maximum value. What is the normalized corrected value at 33.5 mm?

So my problem is that I'm not sure what I should be subtracting the background 4.7 value from. Without the background, I know that I would just need to divide 15.3 by 20.1.

Can someone please help me understand where I'm supposed to be subtracting background from? Any help would be appreciated.

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