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3. How many joules of electrical energy are consumed by a 100 W light bulb which is left on for 10.0 min? 4. Assume that

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3. How many joules of electrical energy are consumed by a 100 W light bulb which is left on for 10.0 min? 4. Assume that the light bulb in question #3 is 80.0% efficient in its conversion of electrical energy into light energy. If all the light energy from the bulb is focused on a spot of area 1.00 cm 2, what is the intensity of light at the spot

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