a) Look at the photograph of the lab set-up. Since the light source gets very ho
ID: 2019104 • Letter: A
Question
a) Look at the photograph of the lab set-up. Since the light source gets very hot, what affect do the heat photons have on photoemission?1- none, since the infrared photons are absorbed by the air before they reach the metal
2- they increase the number of photoelectrons, but by the same amount no matter how hot the light source
3- none, since infrared photons are below the cut-off frequency
4-they decrease the number of photoelectrons by heating the metal and raising the work function
b) In procedure 1: when you increase the voltage V1 (the retarding potential), you expect the output voltage V2 to
1 - increase
2- remain the same
3- first increase, then decrease
4- first decrease, then increase
5- decrease
Explanation / Answer
a)3 b) 5 When you increase the voltage V1 (retarding potential) the output voltage V2 decreases because on increasing the retarding potential fewer electrons reach and hence ouput is low
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