Answer:
720 Joules
Explanation:
Given: 60 W light bulb powered by 620,000 J of energy. 20 percent efficient in converting electrical energy into light energy
To find: how many joules of light energy does this light bulb produce each time?
Formula: [tex]E = \frac{hc}{A}[/tex]
Solution: The total amount of energy generated by the light bulb every minute is 3600 Joules. If the light bulb is only twenty (20) percent efficient in converting that energy to visible light energy, that would be twenty percent of the total.
E (Joules) = P (Watts) X t (seconds)
E = 60 W X 60 seconds
E = 3600 Joules of energy
20% of 3600 = 720 Joules
Therefore, it produces 720 joules of light each time.
