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Ultraviolet light of 6.2 eV falls on an ...

Ultraviolet light of 6.2 eV falls on an aluminimum surface of work function 4.2 eV. The kinetic energy of the fastest electron is Joules is

A

3.2

B

`3.2 xx 10^11`

C

`3.2 xx 10^-17`

D

`3.2 xx 10^-19`

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Ultraviolet light of 6.2 eV falls on aluminium surface (work function = 4.2 eV). The kinetic energy (in joule) of the fastest electron emitted is approximately: