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1) At noon on a clear day, sunlight reaches the earth's surface at Madison, Wisconsin, with...

1) At noon on a clear day, sunlight reaches the earth's surface at Madison, Wisconsin, with an average intensity of approximately 4.00 kJ·s−1·m−2. If the sunlight consists of photons with an average wavelength of 510.0 nm, how many photons strike a 9.60 cm2 area per second?

2) A watt is a unit of energy per unit time, and one watt (W) is equal to one joule per second (J⋅s−1). A 40.0 W incandescent lightbulb produces about 9.00% of its energy as visible light. Assuming that the light has an average wavelength of 510.0 nm, calculate how many such photons are emitted per second by a 40.0 W incandescent lightbulb.

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