Ultraviolet radiations of 5.4 eV fall on an aluminium surface (work function 3.4 eV). The kinetic energy (in joule) of the fastest electron emitted is approximately

1
3.2 × 10–21
2
3.2 × 10–19 
3
3.2 × 10-17
4
3.2 × 10-15

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