You are in possession of a small wine. You do not know the element. But you perf

Question

You are in possession of a small wine. You do not know the element. But you perform several careful measurements of the physical and electrical properties. You are to use the results of these experiments to determine certain physical quantities. Perform the necessary calculations to complete the table. Be sure to show all of your work and proceed in a neat, orderly fashion. Be very careful with units because a simple error will propagate! Physical measurements of the sample show that the wire is actually a standard American Wire Gauge (AWG) size. You know that #19 gauge wire has a diameter of 35.89 mils (thousandths of an inch). In case that bothers you, the diameter is 0.03589 inches. The length of the wire is 1.125 cm. (There are 1000 milli-cm^3 in 1 cm^3 and 1000 milli-cm^2 in 1 cm^2. When you are the professor you can use whatever units you want.) Complete the following tables, showing your work in a neat manner. You have access to un x-ray diffraction instrument with an x-ray lube that has a iron electrode. It is widely known that K_alpha x-rays from Fe have a wavelength of 0.1944 nm. Your analysis shows that the crystal structure is FCC, and the first order Bragg diffraction peak from the {110} planes occurs at an angle of 15.62 degree. You have determined that each atom contributes 1elcctrun to the conduction process. You measure the resistance of the sample by passing a current through the w ire and measuring the voltage difference across the ends. a) Is the amount of power dissipated in the wire a concern for significant healing? b) What is your wire made of? How can you tell? c) Compare the E_F you calculated with a value from a reliable source on the internet.

Explanation / Answer

A) The Amount of power dissipated depends upon the resistance of the wire:

Resistance opposes the flow of an electric current around a circuit. So that energy is required to push the charged particles around the circuit. Resistance would occur when the electrons travelling along the wire collide with the atoms of the wire, causing the flow of electrons to slow

I predict that as the length increases, the resistance will increase. The electrons would collide with the atoms of the wire. If the length of the wire were to be doubled or tripled, the resistance would also be doubled or tripled

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