Final_Sec1_S08

# Final_Sec1_S08 - MatE 153 MatE 153 Section 1 FINAL Spring...

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: MatE 153 MatE 153 Section 1 FINAL Spring 2008 I have not received any information about the questions on this test prior to the exam. During the exam, I will only utilize the provided material and a calculator. During the exam, I will not receive any information from fellow students or utilize any materials such as notes or the textbook. PRINT NAME: ____________________________ SIGNATURE : _____________________________ PARTIAL CREDIT WILL ONLY BE GIVEN IF YOU SHOW ALL YOUR WORK NEATLY!! YOU WILL LOSE POINTS IF YOU DO NOT INCLUDE THE UNITS!! 1 MatE 153 Score: ______ / 100 1. Using text or a diagram, explain how the Hall effect can be used to determine carrier type. (10 points) 2. What is the remnant magnetization? (5 points) 2 MatE 153 3. Why do electrons and holes drift across a pn junction when there is no applied voltage? (5 points) 4. Describe in words (no equations) the meanings of n(E), g(E), and f(E). (5 points) 3 MatE 153 5. You are designing a piece of equipment where you want to limit the current that flows through a certain section. You have chosen to do this by increasing the resistance of a wire in that section. Name 4 ways you can increase the resistance of that section of wire: (5 points) i. ii. iii. iv. 6. Using a diagram or words (no equations), explain the difference between a Fermi energy in a metal versus a semiconductor. (5 points) 4 MatE 153 7. What is the drift velocity of an electron in a platinum (Pt) wire that is 0.2 m long, heated to 400K and has 4V dropped across it? Assume Pt has 2 valence electrons. (15 points) 5 MatE 153 8. The momentum of light shone on an electron in a well is 1.8 ×10-34 kg m/s. This excites the electron from the ground state to the 3rd energy level. What is the size of the well? (10 points) 6 MatE 153 9. Si is doped with 1018 atoms/cm3 of P (from Column V). Calculate the Fermi energy (relative to the intrinsic value) at 100K. (15 points) 7 MatE 153 10. A silicon sample that is 2 cm long and has a cross sectional area of 3 cm2 is doped with Al (from Column III) at 5 × 1018 cm-3 and Sb (from Column V) at 4 × 1018 cm-3. Your sample is at room temperature (300K). Assume all the dopants are ionized. What is the resistance of the doped sample? (10 points) 8 MatE 153 11. You have a solenoid that has 15 coils in 0.1 cm and has a current of 3A in it. a. What is the magnetic permeability of the sample if the total magnetization B is 4.5×10-2 Wb/m2? (12 points) b. Is the sample above paramagnetic or diamagnetic? (3 points) ________________ 9 ...
View Full Document

## This note was uploaded on 03/13/2012 for the course ISE 130 taught by Professor Patel,n during the Fall '08 term at San Jose State.

Ask a homework question - tutors are online