https://session Physics 2703 CSUEB com/myct/temView of set next&assignment; robl

Question

https://session Physics 2703 CSUEB com/myct/temView of set next&assignment; roblem Helgren Spr 2017 Homework E08.ch 28 Problem 28.13 Problem 28.13 zink has a work function of 4.3 ev Part A What is the longest wwe length of that release an electron a zink Express your answer with the som appropriate units. A 290 nm Correct Part B A 45 eV pheten utrkes the surface of zink and an electron is emeted What is the Possible speed of the Express your answer with the appropriate units. 0.8 Submit MAm mers Incorrect Again: 28 attempts remain na

Explanation / Answer

Part B

KE of photoelectrons= Photon energy- work function

= 4.5-4.3 = 0.2 eV

speed v = sqrt(2KE/m)

= sqrt(2*0.2*1.6e-19/9.1e-31)

= 265197 m/s Answer

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