At noon on a clear day, sunlight reaches the earth\'s surface at madison, wisconsin, with an average intensity of approximately 2.00 kj·s–1·m–2. if the sunlight consists of photons with an average wavelength of 510.0 nm, how many photons strike a 4.80 cm2 area per second?

I = average intensity of sunlight reaching at Madison = 2000 Js⁻¹m⁻²

A = area on which the light strike = 4.80 cm² = 4.80 x 10⁻⁴ m²

energy received per second by the area is given as

E = IA

inserting the values

E = (2000) (4.80 x 10⁻⁴)

E = 0.96 J

λ = wavelength of the photons in the sunlight = 510 x 10⁻⁹ m

c = speed of light = 3 x 10⁸ m/s

h = plank's constant = 6.63 x 10⁻³⁴ J-s

n = number of photons received per second

energy received per second is also given as

E = n h c /λ

inserting the values

0.96 = n (6.63 x 10⁻³⁴) (3 x 10⁸) /(510 x 10⁻⁹)

n = 2.5 x 10¹⁸ per second

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation:

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