A. Show that the elapsed rain time from falling past radius r-| to zipping past a smaller radius r2 is given by the expression
Rewrite this equation so that the variables are train/M and r/M and so that M occurs nowhere else in the equation. Atypical curve is plotted in Figure 4 for a raindrop that passes r = 5M at wristwatch time zero (t| rajn = 0). (These radii are measured by the method shown in the box on page B-8.)
B. What happens to the value of the time lapse in equation  when the initial radius ^ becomes infinite? How do you account for this result?
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