How this works out? for science ?

  • Thread starter Thread starter Jenny P
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Jenny P

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im not looking for someone to give me the answer i really need someone who can show me the steps to get the answer: the question is : Find the efficiency of a 23W fluorescent tube that is used 4.0 h per day and in that time produces 6.624 x 10^4 J of useful light energy?
how do i find the efficiency ?
 
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