The "oxygen crisis" occurred around
A) 2 billion years ago
B) 3.5 billion years ago
C) 2.5 billion years ago
D) 4 billion years ago
A
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The cylindrical filament in a light bulb has a diameter of 0.050 mm, an emissivity of 1.0, and a temperature of 3000°C. How long should the filament be in order to radiate 60 W of power? (? = 5.67 × 10-8 W/m2 ? K4)
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Answer the following statement true (T) or false (F)
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