hw3 - ECE320 Homework 3 Cornell University Spring 2006...

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ECE320 Homework 3 Spring 2006 Cornell University T.L.Fine Please hand in this assignment at the end of lecture on Tuesday, 21 February. Use only your assigned three-digit code and not your name. The first examination will be held on Tuesday, 21 February, from 7:30pm to 9pm in Malott 251 and 253. It will have three questions that are drawn from material in Chapters 2 and 3 and Sections 4.1 through 4.4. There will be a class at the regular time of 10:10am in PH101 on that Tuesday so that Prof. Fine can respond to questions about this material from those who attend. No new material will be covered that day. 1. The average current emitted by a cathode is I amps (coulombs/sec.). The charge emitted over time T seconds is Q coulombs, where a coulomb is approximately (but assume it to be exactly) 6 × 10 18 electrons. (a) If I is one nanoampere and T is one nanosecond then what is the average number of electrons emitted in this time? (b) What is the probability that no electrons will be seen in this time?
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