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    Have tried it but don't really understand what to do.

    The photocell is connected to a 12 V supply and a sensitive ammeter which can detect a current of1.0 x 10-9 A. Only 5.0% of the photons of average energy 4.0 x 10-19 J incident on the plate Acause electrons to be released. Calculate the minimum light energy that plate A must absorb persecond for the photocell circuit to detect a current.

    I don't think any info from the previous parts of the Q is needed. Any help would be great
 
 
 
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