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Questions  

In a photo-electric cell, current stops when a negative potential of 1.5v is given to the collector w.r.t. emitter.  The maximum K.E. of emitted electron is

a
2.4×10-19 joule
b
0.8×10-19 erg
c
0.5 joule
d
0.5 erg

detailed solution

Correct option is A

kE=ev0       =1.6×10−19×1.5      =2.4×10−19joule

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