Quiz2-Sol-SSI09

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

This preview shows pages 1–2. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/04/2010 for the course PHYSICS 2C taught by Professor Hicks during the Summer '09 term at UCSD.

Page1 / 4

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online