Measurements in addition to Uncertainties Uncertainties in addition to Errors Resolution This is the s

Measurements in addition to Uncertainties Uncertainties in addition to Errors Resolution This is the s www.phwiki.com

Measurements in addition to Uncertainties Uncertainties in addition to Errors Resolution This is the s

Garofoli, Joe, Features Writer has reference to this Academic Journal, PHwiki organized this Journal Measurements in addition to Uncertainties Uncertainties in addition to Errors Resolution This is the smallest change in a quantity that can be measured by an instrument. E.g. What is the resolution of a. A 30cm ruler b. An analogue wristwatch c. A thermometer We prefer high resolution instruments: A micrometer screw gauge measures to a resolution of 1/100 mm. A vernier calliper measures to a resolution of 1/10mm. Error in addition to uncertainty An error that is repeated in all readings taken is called a systematic error. Poor instrument calibration leading to a ‘zero error’ is an example of a systematic error. R in addition to om errors occur often during repeated experiments, causing the reading to vary above in addition to below the true value. If values have to be estimated, there is often a r in addition to om error. Q. Which of these two types of errors can be reduced by taking an average of repeated readings

Strayer University-Chesapeake Campus VA www.phwiki.com

This Particular University is Related to this Particular Journal

Precision in addition to Accuracy If repeated measurements always give very similar results, they are precise – they have small r in addition to om error in addition to low uncertainty. However, this does not mean they are accurate. If repeated measurements are fairly near to the true value, they are accurate – the systematic error is small. However, they may not be precise. Accurate but imprecise Precise but inaccurate Ruler scale True value To reduce error: Always repeat readings if possible. Take readings at eye level Use take at least 6 sets of readings Check as long as a zero error be as long as e starting

Determining Errors in addition to Uncertainties On a single reading, the (+ or -) uncertainty could be considered equal to either the instrument resolution or the human error, depending which is largest. Q. Measure the length of your pen using a ruler. What is a) the uncertainty b) the % uncertainty

If an average reading is calculated from a few readings, the uncertainty equals ½ x the range: E.g. In an experiment a toy car was rolled repeatedly down a ramp in these times 8.12s, 8.16s, 8.08s, 8.14s, 8.10s Average time = 8.12s, however we are not certain that this is the true value. Range = 8.16 – 8.08 = 0.08 so uncertainty = +/-0.04 Time = 8.12 +/- 0.04 s (Note: With multiple oscillations, when dividing to find T you also divide the absolute uncertainty) Subtitle Text Subtitle Text

Subtitle Text Subtitle Text Subtitle Text

Subtitle Text

Garofoli, Joe San Francisco Chronicle Features Writer www.phwiki.com

Garofoli, Joe Features Writer

Garofoli, Joe is from United States and they belong to San Francisco Chronicle and they are from  San Francisco, United States got related to this Particular Journal. and Garofoli, Joe deal with the subjects like Features/Lifestyle; Local News

Journal Ratings by Strayer University-Chesapeake Campus

This Particular Journal got reviewed and rated by Strayer University-Chesapeake Campus and short form of this particular Institution is VA and gave this Journal an Excellent Rating.