Q:  The width at the top of the dip is (t<sub>4</sub> - t<sub>1</sub>).
            What is this time, measured in phase (fractions of a period)?
            What is this time, measured in seconds?

 
              The width at the top is about  0.040 in phase, so


                  (t4 - t1)  =  0.040 * period  =  1.79 x 10^4  seconds

                             =  0.040 * 4.32 x 10^(5)  seconds

                             =  1.73 x 10^4  seconds



  Q:  The width at the bottom of the dip is (t<sub>3</sub> - t<sub>2</sub>).
            What is this time, measured in phase (fractions of a period)?
            What is this time, measured in seconds?


              The width at the top is about  0.014 in phase, so


                  (t4 - t1)  =  0.014 * period  =  1.79 x 10^4  seconds

                             =  0.014 * 4.32 x 10^(5)  seconds

                             =  6.05 x 10^3  seconds