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     EduGorilla 
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    Ultraviolet radiation of energy 6.2 eV falls on the surface of aluminium of work function 4.2 eV. What will be the K.E. of the fastest electron (in joule)?

    Options :-

    1. 3 x 10-21
    2. 3 x 10-19
    3. 4 x 10-17
    4. 3 x 10-15
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