Problem 58P

(a) Find the electric and magnetic field amplitudes in an electromagnetic wave that has an average energy density of 1.0 J/m3. (b) By what factor must the field amplitudes be increased if the average energy density is to be doubled to 2.0 J/m3?

Week 2 Lecture 4 9/7/16 Mass spectrometry - Mass spectrometry is how we determine the percentages of each naturally occurring isotope - Magnetic field separates ions based on ratio of mass to charge Uncertainty and Significant Figures - When a measurement is made, there is always some uncertainty, because we can only approximate the measurement - Cost of measurement, different measuring tools cost different amounts the more accurate of the measurement or further out in decimal places, the more expensive the device. - This last digit is an estimate and is said to be uncertain