# Physics 1010: The Physics of Everyday Life. TODAY Black Body Radiation, Greenhouse Effect

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1 Physics 1010: The Physics of Everyday Life TODAY Black Body Radiation, Greenhouse Effect 1

2 Admin Stuff Exams are at back of room, alphabetically in four piles. Please collect AFTER class Grades posted on website Average for exam was ~70% 2

3 Black Body Radiation All bodies radiate according to their temperature A black body is a body that absorbes all radiation incident upon it Total energy radiated per unit area given by Stefan-Boltzmann Law P = power radiated per unit area = energy radiated per unit time per unit area 3

4 A black body is easy to construct: Consider a a large cavity with a tiny hole drilled into it. Of all the light that goes through the hole, only an insignificantly small amount gets reflected back out. The rest is bounced around the interior of the cavity so many times, that it is finally totally absorbed. The cavity is then a "Black Body". 4

5 Total Solar Power Output The radius of the sun is 696,000km. Its surface temperature is 5800K, what is the total power radiated by the sun? The surface area of a sphere is given by A=4πR 2 Stefan constant: σ = 5.67*10-8 J K -4 m -2 s -1 A) 3.83*10 26 W B) 3.83*10 30 W C) 3.83*10 20 W D) 3.83*10 16 W The total power output of a star is call the Luminosity of the star 5

6 Total Solar Power Output The radius of the sun is 696,000km. Its surface temperature is 5800K, what is the total power radiated by the sun? The surface area of a sphere is given by A=4πR 2 Stefan constant: σ = 5.67*10-8 J K -4 m -2 s -1 A) 3.83*10 26 W B) 3.83*10 30 W C) 3.83*10 20 W D) 3.83*10 16 W The total power output of a star is call the Luminosity of the star 6

7 Total Power Intercepted by Earth The Earth circles the sun at 150,000,000km, and its radius is 6400km. What fraction of the sun s power is incident on the Earth? A) 4.55*10-5 B) 4.55*10-10 C) 4.55*10-15 D) 4.55*

8 Total Power Intercepted by Earth The Earth circles the sun at 150,000,000km, and its radius is 6400km. What fraction of the sun s power is incident on the Earth? A) 4.55*10-5 B) 4.55*10-10 C) 4.55*10-15 D) 4.55* πr E2 /4πR O 2 =(1/4)(6400km/ km) 2 =4.55*10-10 At the Earth s distance from the sun, the total solar power is spread over the area of a sphere of radius 150,000,000km, but the Earth covers only a circle of radius 6400km out of all that area 8

9 Total Power Radiated by Earth The Earth absorbs 70% of the solar power incident upon its surface. What is the total power radiated by Earth? A) 1.22*10 8 W B) 1.22*10 11 W C) 1.22*10 14 W D) 1.22*10 17 W 9

10 Total Power Radiated by Earth The Earth absorbs 70% of the solar power incident upon its surface. What is the total power radiated by Earth? A) 1.22*10 8 W B) 1.22*10 11 W C) 1.22*10 14 W D) 1.22*10 17 W Conservation of Energy: at equilibrium, the Earth has to radiate as much power as it receives from the sun, or else it would either heat up or cool down P out =0.7*P in =0.7*(4.55*10-10 )*(3.83*10 26 W)=1.22*10 17 W 10

11 Naked Earth Temperature What would the temperature of the Earth be if it has to radiate 1.22*10 17 W, and it had no greenhouse effect? T kelvin = T celsius A) -18C B) 0C C) 18C D) 32C 11

12 Naked Earth Temperature What would the temperature of the Earth be if it has to radiate 1.22*10 17 W, and it had no greenhouse effect? T kelvin = T celsius A) -18C B) 0C C) 18C D) 32C 12

13 Greenhouse Effect Sun (5800 o K) radiates mostly at optical wavelengths Earth (~300 o K) radiates mostly at infrared wavelengths Greenhouse gasses in atmosphere absorb some IR wavelengths, let others pass to space Greenhouse gasses re-radiate absorbed energy in random direction, so half goes back to the ground. Overall effect: τ is the greenhouse strength 13

14 Greenhouse Effect For one-layer atmosphere, the incindent power, I s, is absorbed by the ground. The ground then radiates back I g Some of I g gets absorbed by the atmosphere, and some is allowed to escape The absorbed power gets re-radiated in a random direction, so on average half goes to space and half back to the ground So now we have I s +I a absorbed by ground, so the ground has to have a higher T. 14

15 Greenhouse Earth Temperature What would the greenhouse strength of the Earth s atmosphere be if it has to radiate 1.22*10 17 W, and its Average temperature is 288 o K? T kelvin = T celsius A) 0.33 B) 0.65 C) 1.35 D)

16 Greenhouse Earth Temperature What would the greenhouse strength of the Earth s atmosphere be if it has to radiate 1.22*10 17 W, and its Average temperature is 288 o K? T kelvin = T celsius A) 0.33 B) 0.65 C) 1.35 D)

17 Greenhouse Venus Temperature Venus has a multi-layer atmosphere Each layer increases τ by one For Venus, τ=121 The temperature of Venus is 3.3 times greater that it would be without the greenhouse effect (732 o K instead of 220 o K) 17

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