An incandescent bulb produces 520 lumens and has an efficacy of 13 lm/W.

2 answers:

6 0

(520 lm) divided by (13 lm/W)

= (520 lm) times (W/13lm)

= (520/13) (lm · W / lm)

= 40 W

4 0

Answer:

Explanation:

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