Why might excess CO2 in the atmosphere heat up the earth?
A) Because CO2 reacts with and thus destroys the ozone layer.
B) Because CO2 absorbs, or traps, infra-red radiation.
C) Because CO2 is an important participant in the photosynthesis process.
D) Because CO2 absorbs, or traps, ultra-violet radiation.
E) Because CO2 increases Earth's "reflectivity."
B
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A proton, which moves perpendicular to a magnetic field of 1.4 T in a circular path of radius 0.074 m, has what speed? (qp = 1.60 × 10^?19 C and mp = 1.67 × 10^?27 kg)
a. 7.3E+5 m/s b. 2.8E+7 m/s c. 5.1E+6 m/s d. 9.9E+6 m/s e. 3.9E+6 m/s
24.0 moles of a diatomic ideal gas with a molar specific heat 5R/2 is heated from 20.0°C to 100°C. What is the change in entropy of the gas?
A) -0.365 J/K B) 0.365 J/K C) 802 J/K D) -19.9 J/K E) 120 J/K
An example of a transverse wave is a
a. sound wave in air b. wave on a rope c. water wave d. sound wave in a metal bar e. none of the above