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Ultraviolet radiation of 6.2 eV falls o...

Ultraviolet radiation of 6.2 eV falls on an aluminium surface (work - function = 4.2 eV). The kinetic energy in joule of the fastest electrons emitted is

A

`3.2xx10^(-21)`

B

`3.2xx10^(-19)`

C

`3.2xx10^(-17)`

D

`3.2xx10^(-15)`

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AAKASH INSTITUTE ENGLISH-DUAL NATURE OF RADIATION AND MATTER -ASSIGNMENT SECTION A. Objective (Only one answer)
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