Quiz2-Sol-SSI09

Quiz2-Sol-SSI09 - Physics 2C Summer Session II Quiz #2...

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Physics 2C Summer Session II Quiz #2 Multiple Choice. Choose the answer that best completes the statement or answers the question. 1. Astronomers observe a star whose black body spectra has a maximum intensity at max = 489 nm = 489 10 9 m: What is the radius of this star if its total radiated power is P = 4 : 48 10 26 W ? A) 790 ; 000 km B) 767 ; 000 km C) 714 ; 000 km D) 695 ; 000 km E) 802 ; 000 km T = 2 : 898 10 3 = 2 : 898 10 3 489 10 9 = 5926 K: From the Stephan-Boltzmann law P = e±AT 4 = ± 4 ²r 2 T 4 ! r = r P 4 ²± 1 T 2 r = r 4 : 48 10 26 4 ² 5 : 67 10 8 1 5926 2 = 7 : 14 10 8 m r = 714 ; 000 km ! C 2. A vacuum chamber is pumped down to a pressure of 10 7 torr; where 1 torr = 1 mm of mercury which is equivalent to 1 atm= 760 where 1 atm = 1 : 013 10 5 Pa: Assuming that nitrogen makes up 79% of the air left in the chamber, how many molecules of nitrogen are contained in one liter at 20 ± C ? A) 6 : 9 10 11 B) 2 : 8 10 15 C) 3 : 3 10 12 D) 2 : 6 10 12 E) 2 : 8 10 12 . The pressure in SI units is
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Quiz2-Sol-SSI09 - Physics 2C Summer Session II Quiz #2...

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