4.38 a diode operates in a series circuit with a resistance r and a dc source v. a designer, considering using a constant-voltage model, is uncertain whether to use 0.7 v or 0.6 v for vd. for what value of v is the difference in the calculated values of current only 1%? for v = 3 v and r = 1 k! , what two current estimates would result from the use of the two values of vd? what is their percentage difference?

4. now look at the green lines you created by connecting the three boiling point data points and the three melting point data points. for each of these lines, describe any trends you see. 5. locate the elements on your periodic table that you circled in green on your graph. what term or description would you use to identify these elements with respect to the periodic table? 7. using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers.