Lecture1

Lecture1 - P309 Intermediate Physics Laboratory Lecture 1:...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
P309 Intermediate Physics Laboratory Lecture 1: Experimental Uncertainties Reading: Squires “Practical physics”, pages 1-30 Handouts from http://physics.indiana.edu/~courses/p309/s09 “Experimental uncertainties” “Basic statistics” Mark Messier SW302, messier@indiana.edu 15 January 2008 1 Thursday, January 15, 2009
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
“The” Scientifc Method Experimental physics has as its essential goal the precise measurement oF the parameters oF the natural universe. These can then be compared to our models (“theories”) oF the natural universe to select the models that most accurately represent reality. The key branch point in this process is this one: “Do measurement and theory agree?” As scientists, we need to be able to answer this question in an objective and quantitative way. As such, we need not only an accurate measurement but a reliable estimate oF the uncertainty in that measurement. Example: Theory: Measure time For object to Fall: Measurement Theory Do measurement and theory agree? Y N Theory lives! Continue testing with improved measurements Is measurement correct? Y Refine theory Continue testing with new and/or improved measurements N Refine experimental techniques “the” scientifc method R E =6 . 378 × 10 6 m M E =5 . 974 × 10 24 kg G . 6743 × 10 - 11 m 3 / kg / s 2 g = GM E R 2 E =9 . 8017 m / s 2 h =3 . 0m t =0 . 80 s g = 2 x t 2 . 37 m / s 2 Do these agree? IF uncertainty is ±0.5 then yes, they are consistent with each other IF uncertainty is ±0.05, then no, they diFFer by a signifcant amount Experimenter has responsibility to provide not only the best estimate For the parameter being measured but also an accurate, quantitative estimate oF the uncertainty in the value quoted 2 Thursday, January 15, 2009
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/20/2012 for the course P 309 taught by Professor Urheim during the Spring '11 term at Indiana.

Page1 / 8

Lecture1 - P309 Intermediate Physics Laboratory Lecture 1:...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online