PROBLEM 2 Examine the table below for the work functions of a few metals. Choose three metals and compute the minimum frequency of light required to eject electrons in each case. Metal Work Function (in eV) 2.30 Minimum Frequency Potassium Sodium 2.75 Aluminum 4.28 Tungsten 4.55 Copper 4.64 Iron 4.70 Gold 5.10

PROBLEM 2 Examine the table below for the work functions of a few metals. Choose three metals and compute the minimum frequency of light required to eject electrons in each case. Metal Work Function (in eV) 2.30 Minimum Frequency Potassium Sodium 2.75 Aluminum 4.28 Tungsten 4.55 Copper 4.64 Iron 4.70 Gold 5.10

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter12: Electronic Control Devices

Section: Chapter Questions

Problem 14RQ

See similar textbooks

Similar questions

How many valence electrons are generally contained in materials used for insulators?
For the semiconductor diode the "on" state will support a current in the direction of the in the symbol. Your answer The region of uncovered positive and negative ions is called the due to the diminution of free carriers in the region. (Two Words) Your answer What is the net flow of charge in the absence of an applied bias across a semiconductor diode? Your answer
Using drawing and Explanation. Effect of light: What will happen if you shine a light on three parts of the p-n junction. Show the effect of light separately on p-si, n-si, and depletion regions. ww.
How many valence electrons does a semiconductor has? a. 2 b. 3 c. 6 d. 4 When pure semiconductor is heated, its conductance a. Goes up b. Goes down C. Remains the same d. Can't say When a trivalent impurity is added to a pure semiconductor, it becomes a. A conductor b. An intrinsic semiconductor C. P-type semiconductor d. N-type semiconductor
5. A voltage source produces a "Triangle" wave and is connected to a series diode and resistor circuit as shown. D1 KH D V1 #1 V R1 R Using the nominal piecewise linear model for a diode, determine from the following possibilities the graph that best represents the voltage across the resistor? (Delete those that do not apply) (Blue curve VR, dashed curve V1). Then determine which graph best represents the voltage across the diode.
How many free electrons does a p-type semiconductor contain?Please select one:a.Same number as holesb.Manyc.Noned.Only those produced with thermal energy
uO 9:.0 A docs.google.com * ZAIN IQ l. Q3/B: Assume an ideal diode model for all the diodes in the circuit below. calculate voltages and currents through D1 and D2 9kQ 1N1199C R2 D1 18KQ 1N1199C D3 1N1199C V2 =12 V R3 1kQ R4 5kQ 1.22 V 11 mA 0.5 A O VD1 ID1 VD2 ID2 صفحة 4 من 6
1 (b) When Ef touches intrinsic Fermi energy Eri, comment on whether an extrinsic semiconductor will stay extrinsic or not. What will be ultimate state of semiconductor in this case?
a. If you do not go completely around the loop when applying Kirchhoff’s voltage law, then the algebraic sum of the voltages cannot be determined the algebraic sum of the voltages will always be positive the algebraic sum of the voltages will always be negative the algebraic sum is the voltage between the start and finish points b. A p -type semiconductor is a semiconductor doped with impurity atoms whose electron valence is +4 pentavalent impurity atoms trivalent impurity atoms
When a pentavalent impurity is added to a pure semiconductor, it becomes ......... 1. An insulator 2. An intrinsic semiconductor 3. p-type semiconductor 4. n-type semiconductor
-3 A sample of silicon is doped n-type to a value 223300443149266120000000 m If the electron mobility is 0.12 m²v-1-1, calculate the conductivity in the sample in 2-1m-1 (give your answer as an integer number)
4. Assume the Blue LED has a forward turn on voltage of 4 V and exhibits ideal diode behavior. For the circuit below, sketch the voltage across the diode and the voltage across the resistor (versus time) for the following Vin values. On your waveforms, indicate the time periods when the LED is on. a. Vin= 3 sin(2π *60t) V b. Vin = 5 sin(2π *60t) V Blue LED # Vin 1k R2