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You buy a 75-W lightbulb in Europe, where electricity is delivered at 240 V.
If you use the bulb in the United States at 120 V (assume its resistance does not change), how bright will it be relative to 75-W 120-V bulbs?
Assume that brightness is proportional to power consumption.
a.2.5 X 10^-1
b.1.0
c.7.7 X 10^2
d.19
e.4.0
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