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PracticeTest01 - EES 108 Earth and Atmosphere Practice...

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EES 108: Earth and Atmosphere Practice Test #1 For Tuesday September 27 Instructions You will have 75 minutes to complete the test. Answer all 20 multiple choice questions, which are worth 3 points each, and 5 out of the 6 short-answer questions, which are worth 10 points each, for a maximum possible total score of 110 points. The actual test will be quite similar to this one.
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EES 108 Practice Test # 1 Physical Constants Freezing point of water 273 K Boiling point of water 373 K Stefan-Boltzmann constant σ = 5 . 67 × 10 - 8 W / m 2 K 4 Planck constant h = 6 . 63 × 10 - 20 J s Average Distance from Earth to sun 1 AU = 1 . 50 × 10 11 m Average Distance from Mars to sun 1 . 52 AU Average Distance from Venus to sun 0 . 72 AU Radius of Earth 6 . 4 × 10 6 m Solar constant (solar flux at Earth) S Earth = 1370 W / m 2 Average albedo of the Earth A = 0 . 3 Average albedo of Venus A = 0 . 8 Average albedo of Mars A = 0 . 2 Greenhouse effect on Venus Δ T g = 510 K Greenhouse effect on Mars Δ T g = 6 K Effective radiating temperature of the Earth T e = 255 K Average surface temperature of the Earth T s = 288 K Atmospheric pressure at sea level P 0 = 1 . 013 bar Dry adiabatic lapse rate 10 C / km Normal tropospheric environmental lapse rate 6 . 5 C / km Dewpoint lapse rate L d = 2 C / km Average scale height of the atmosphere H 0 = 5 . 6km –2 of 18– Tuesday September 27
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EES 108 Practice Test # 1 Equations Solar zenith angle zenith angle = latitude - declination (Positive latitude = northern, negative = southern) Solar elevation angle elevation angle = 90 - zenith angle Stefan-Boltzmann equation E = σT 4 Wien’s law λ max = 2898 μ m / K T Temperature conversion: Kelvin to Celsius T( C ) = T( K ) - 273 Fahrenheit to Celsius T( C ) = T( F ) - 32 1 . 8 Celsius to Fahrenheit T( F ) = 1 . 8 T( C ) + 32 Temperature lapse T(h) = T 0 - Lh , where T 0 is temperature at sea level, h is the height above sea level, and L is the lapse rate. Dew point lapse in unsaturated air T d (h) = T d, 0 - L d h , where T d (h) is the dew point at some height h above sea level, T d, 0 is dew point at sea level, h is the height above sea level, and L d is the dew point lapse rate. Lifting Condensation Level LCL = T - T d 8 C / km , where T = air temp and T d = dew point Barometric law P(h) = P 0 × 0 . 5 h/H 0 , where P(h) is the pressure at height h , P 0 is the pressure at sea level, and H 0 is the scale height of the atmosphere. Calculating fourth roots The fourth root ( 4 ) is the same as the square root of the square root. On your calculator, it may be easier to push the square-root ( ) key twice than to take the fourth root directly. Calculating fourth powers The fourth power is the same as the square of the square. On your calculator, if you have an x 2 key, it may be easier to push x 2 twice than to take the fourth power directly. –3 of 18– Tuesday September 27
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EES 108 Practice Test # 1 Saturation specific humidity of water vapor Temp ( C ) Saturation spe- cific humidity ( g / kg ) - 40 0 . 10 - 30 0 . 30 - 20 0 . 75 - 10 2 . 0 0
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