Uncertainty and Sig Figs 1.2

This is probably the most boring topic a physics student will ever study in his or her career. Uncertainty of measurements and significant figures. But they are very important when it pertains to physics.

Uncertainty is a difference in measurements between two different devices. Lets say we have a meter stick and a millimeter caliper. We are going to use these to measure the width of a novel book. The meter stick will have a greater uncertainty than the millimeter caliper. So using the right measure instrument for the job is important.

Significant figures are also important, but boring, when it comes to physics. Again, lets say you want to measure the speed of an electron moving about on an atom. Would you want to measure that in Km/Hr, absolutely not. An electron moves extremely fast. Theoretically, lets say, an electron is moving at the speed of light. The speed of light is 300000000 meters/second. About. So how many sig figs is that number? 1. We must turn that large number into scientific notation. 3.0E8. This is the right way to express the speed of light. But I think I forgot something. Can you figure it out?

Uncertainty and sig figs are important aspects of physics. You will use them in everyday physics. Not just in your boring lecture halls.

P.S. I forgot my units. 3.0E8 m/s

Questions? Email me at mjacks66@msudenver.edu

Mark Jackson