laurenppylant
27.09.2019 •
Physics
The intensity of sunlight hitting the surface of the earth on a cloudy day is about 0.50 kw/m2 assuming your pupil can close down to a diameter of 2.0 mm and that the average wavelength of visible light is 550 nm, how many photons per second of visible light enter your eye if you look up at the sky on a cloudy day
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Ответ:
Power = 0.50 kW / m^2 ( π (0.001^2)) = 1.57x10^-6 kW = 1.57x10^-3 W
The energy of the visible light can be calculated from the expression:
Energy = hc / wavelength
where h is the planck's constant and c is the speed of light
Energy = (6.63 x 10^-34) (3 x 10^8) / 550 x 10^-9
Energy = 3.62 x 10^-19 J
Number of photons per second = 1.57x10^-3 J/s / 3.62 x 10^-19 J
Number of photons per second = 4.34x10^15
Ответ: